De fleste vira er ret nemme at slippe af med. Bare^(Just) åbn en antivirusscanner, vent på, at den samler resultater, og slet derefter det, den finder. Nogle gange vil virussen dog bare ikke forsvinde, og ingen almindelig antivirusløsning^{(regular antivirus solution)} ser ud til at hjælpe.

Så hvad skal du med irriterende, svære at slette vira? Inden for rammerne af antivirussoftware er en hel kategori af værktøjer, der foretager scanningen, før^(before) operativsystemet starter. Ofte^(Often) kaldet bootbare antivirusprogrammer, scanner de filer og fjerner virus, før de overhovedet har en chance for at åbne.

Below are the best ways to remove viruses before the operating system starts. If you’re not familiar with this process, we’ll go over all the steps, including how to download the scanner and what to do next to have it run at startup instead of your operating system.

Tip: If you get viruses often, learn how you should be protecting your computer from hackers and malware.

How a Bootable Antivirus Works

There are two types of bootable antivirus software. One is a self-contained program that you have to install on a USB device or disc and then boot from it when your computer starts up. What happens is that the software on that device or disc is started instead of your operating system, and then you can run the scan and remove viruses from there.

Den anden type er installeret på din computer og fungerer som en normal antivirusløsning, men inden for den er der mulighed for også at køre boot-time scanninger. Bare^(Just) genstart computeren og lad scanningen køre sin gang. Dette er den nemmeste metode for de fleste mennesker, men det virker ikke, hvis virussen er så skadelig, at den ikke lader dig starte operativsystemet korrekt. 

Du vil gerne bruge den ene metode frem for den anden afhængigt af din specifikke situation, så vi vil gennemgå, hvordan du bruger begge.

Brug en disk eller en USB-enhed^{(Use a Disc Or USB Device)}

Den første type bootbart antivirusprogram er en ISO-fil^{(an ISO file)} , som du downloader til din computer og derefter sætter på en separat enhed, så du kan starte fra den. 

Der er masser af muligheder for denne type, herunder Trend Micro Rescue Disk , Comodo Rescue Disk , Anvi Rescue Disk , Kaspersky Rescue Disk og Windows Defender Offline . Nogle af disse programmer kræver en disk, og andre kan bruges med et flashdrev.

Vi vil bruge Adawares Rescue USB-program som et eksempel, da det fungerer med Windows 7 og nyere Windows -operativsystemer, kan opdatere sine definitioner før scanningen og understøtter brugerdefinerede scanninger.

• Besøg linket ovenfor for at downloade ISO -filen. Vælg amd64 -versionen, hvis du har en 64-bit computer, ellers brug x86 til 32-bit. Denne software er over 1 GB i størrelse, så det kan tage et stykke tid at downloade. Nogle af de andre startbare AV-programmer, der er anført ovenfor, er meget mindre, hvis tiden er et problem.
• Download også Rufus , programmet vi skal bruge til at sætte softwaren på et flashdrev. Der er en bærbar version^{(portable version)} på downloadsiden, hvis du hellere ikke vil installere den.

Bemærk^(Note) : Denne software kan også startes fra en disk, så hvis du hellere vil gøre det, kan du brænde programmet til en cd med ImgBurn og derefter springe ned til BIOS - trinnet nedenfor.

• Tilslut din USB -enhed til computeren. Sørg for, at du er okay med at få hele drevet renset. Hvis du ikke er det, så kopier indholdet andetsteds indtil videre.
• Åbn Rufus , og vælg den enhed fra den første rullemenu.
• Vælg VÆLG^(SELECT) , og åbn derefter den ISO -fil, du lige har downloadet.

• Rediger de andre muligheder, hvis det er nødvendigt.
• Tryk på START^(START) .
• Vælg OK på formatadvarslen for at begynde at kopiere det bootbare antivirusværktøj til drevet.
• Afslut Rufus , når processen er færdig.
• Genstart din computer og få adgang til BIOS^{(access BIOS)} . Følg dette link for at lære, hvordan du ændrer startrækkefølgen, så du kan starte til USB -enheden i stedet for OS.
• Vælg OK på Adaware Live CD-prompten.

• Vælg OPDATERING DEFINITIONER^{(UPDATE DEFINITIONS)} for at sikre, at du har de nyeste teknikker til at finde trusler.

• Vælg en scanningstype. Adaware Live^{(Adaware Live)} CD'en understøtter bootsektorscanninger, hurtige scanninger, fulde scanninger og brugerdefinerede scanninger. Hvis du ved, hvilke mapper du vil tjekke for virus, skal du bruge den tilpassede scanningsindstilling. Ellers^(Otherwise) anbefales en fuld scanning for at sikre, at malware bliver fundet, uanset hvor den gemmer sig.

Brug normal antivirus med en bootbar mulighed^{(Use Normal Antivirus With a Bootable Option)}

Hvis proceduren ovenfor vil tage for lang tid eller er for kompliceret, eller du ikke har et diskdrev eller gratis flashdrev, har du stadig en anden mulighed. 

Nogle normale, installerbare antivirusprogrammer har mulighed for at køre en scanning og fjerne virus, når computeren genstarter. De fungerer stort set på samme måde som de opstartbare AV-værktøjer nævnt ovenfor, men er langt nemmere at bruge og udfører al scanning og sletning automatisk.

Nogle gratis antivirus med boot-time scanningsfunktioner omfatter Avast Free Antivirus , Adaware Antivirus og AVG AntiVirus Free . Alle disse programmer fungerer lidt forskelligt; Avast og AVG kræver, at du specifikt slår denne funktion til, mens Adaware vil køre en virusscanning ved opstart automatisk.

Lad os se på, hvordan du bruger Avasts gratis scanner til at fjerne virus, før operativsystemet starter:

• Download programmet via linket ovenfor, og installer det derefter. Pas på eventuelle ekstra tilbud, du kan se under opsætningen, f.eks. at installere ikke-relaterede programmer. Alt hvad du virkelig behøver for at udføre virusrensningsfunktioner er Avast .
• Vælg Beskyttelse^(Protection) fra venstre panel.
• Vælg Virusscanninger^{(Virus Scans)} .

• Vælg ÅBN NU^{(OPEN NOW)} i afsnittet Boot-Time Scan .

• Vælg indstillings-/gearikonet øverst til højre for at åbne Avasts indstillinger for boot-time scanning.

• Rediger^(Modify) eventuelle indstillinger som du ønsker. Som du kan se på dette skærmbillede, kan du justere scannerens følsomhed, scanne for potentielt uønskede programmer, åbne arkiver for at scanne inde i dem, scanne alle de harddiske, der er tilsluttet din computer eller kun systemdrevet, og kontrollere for vira i de programmer, der normalt automatisk starter med operativsystemet.
  
  Du kan også vælge, hvad der skal ske, når en trussel er fundet: Avast kan prøve at rette den uden at slette filen, eller du kan vælge at få filen flyttet ind i et karantæneområde eller blot fjernet.

• Tryk^(Press) på exit-knappen øverst til venstre i indstillingerne for at vende tilbage til starttidsscanningsskærmen.
• Vælg KØR PÅ NEXT PC REBOOT^{(RUN ON NEXT PC REBOOT)} . På denne skærm er også et link til Installer specialiserede definitioner^{(Install specialized definitions)} , som du kan klikke på for at downloade flere definitioner, der formodes at hjælpe med at finde virus under opstartsprocessen.

• Næste gang du genstarter din computer, vil Avast scanne for virus, før operativsystemet starter, og vil håndtere truslerne på den måde, du har angivet i indstillingerne. Bemærk, at kun ved næste^(next) genstart vil den scanne for virus; for at få det til at køre en starttidsscanning igen under en anden genstart, skal du blot gentage disse trin.

Sådan ser det ud under en Avast -virusscanning under opstart. Det kan tage et par timer at fuldføre, afhængigt af hvor mange filer den skal kontrollere.

Vær særlig opmærksom på TXT -filen nævnt i rapportfillinjen^{(Report file)} . Dette bør være det samme for alle computere; det er der, du kan gå, efter at operativsystemet er begyndt at se, hvad Avast Free Antivirus fandt og fjernede.

Du kan til enhver tid stoppe denne scanning ved at trykke på Esc- tasten. Den vil kort fortælle dig, hvor mange filer der blev scannet, og om der blev fundet infektioner, og derefter genstarter din computer normalt i operativsystemet.

How To Remove Viruses Before Your Operating System Starts

Most viruses are fairly eаsy tо get rid of. Just open an antiνirus scanner, wait for it to gather results, and then delete whatever іt finds. Sometimes though, thе virus just won’t go away and no regular antivirus solution seems to help.

So, what are you to do with pesky, hard-to-delete viruses? Within the scope of antivirus software is an entire category of tools that do the scanning before the operating system starts. Often called bootable antivirus programs, they scan files and remove viruses before they even have a chance to open.

Below are the best ways to remove viruses before the operating system starts. If you’re not familiar with this process, we’ll go over all the steps, including how to download the scanner and what to do next to have it run at startup instead of your operating system.

Tip: If you get viruses often, learn how you should be protecting your computer from hackers and malware.

How a Bootable Antivirus Works

There are two types of bootable antivirus software. One is a self-contained program that you have to install on a USB device or disc and then boot from it when your computer starts up. What happens is that the software on that device or disc is started instead of your operating system, and then you can run the scan and remove viruses from there.

The other kind is installed to your computer and functions like a normal antivirus solution, but within it is an option to also run boot-time scans. Just restart the computer and let the scan run its course. This is the easier method for most people, but it won’t work if the virus is so harmful that it’s not letting you start the operating system properly. 

You’ll want to use one method over the other depending on your specific situation, so we’ll go over how to use both.

Use a Disc Or USB Device

The first type of bootable antivirus program is an ISO file that you download to your computer and then put on a separate device so that you can boot from it. 

There are lots of options for this type, including Trend Micro Rescue Disk, Comodo Rescue Disk, Anvi Rescue Disk, Kaspersky Rescue Disk, and Windows Defender Offline. Some of these programs require a disc and others can be used with a flash drive.

We’ll use Adaware’s Rescue USB program as an example since it works with Windows 7 and newer Windows operating systems, can update its definitions before the scan, and supports custom scans.

• Visit the link above to download the ISO file. Pick the amd64 version if you have a 64-bit computer, otherwise use x86 for 32-bit. This software is over 1 GB in size, so it could take a while to download. Some of the other bootable AV programs listed above are much smaller if time is an issue.
• Also download Rufus, the program we’ll use to put the software on a flash drive. There’s a portable version on the download page if you’d rather not install it.

Note: This software can also be booted from a disc, so if you’d rather do that, you can burn the program to a CD with ImgBurn and then skip down to the BIOS step below.

• Plug your USB device into the computer. Make sure you’re okay with having the whole drive wiped clean. If you’re not, copy the contents elsewhere for the time being.
• Open Rufus and select that device from the first drop-down menu.
• Choose SELECT and then open the ISO file you just downloaded.

• Edit the other options if needed.
• Press START.
• Select OK on the format warning to start copying the bootable antivirus tool to the drive.
• Exit Rufus when the process completes.
• Restart your computer and access BIOS. Follow that link to learn how to change the startup order so that you can boot to the USB device instead of the OS.
• Select OK on the Adaware Live CD prompt.

• Select UPDATE DEFINITIONS to ensure that you have the latest techniques necessary to find threats.

• Choose a scan type. The Adaware Live CD supports boot sector scans, quick scans, full scans, and custom scans. If you know which folders you want to check for viruses, use the custom scan option. Otherwise, a full scan is recommended to ensure that malware is found no matter where it’s hiding.

Use Normal Antivirus With a Bootable Option

If the procedure above will take too long or is too complicated, or you don’t have a disc drive or free flash drive, you still have another option. 

Some normal, installable antivirus programs have an option to run a scan and remove viruses when the computer reboots. They work in much the same way as the bootable AV tools mentioned above, but are far easier to use and do all the scanning and deleting automatically.

Some free antivirus with boot-time scanning capabilities include Avast Free Antivirus, Adaware Antivirus, and AVG AntiVirus Free. All of these programs work a bit differently; Avast and AVG require you to specifically turn this feature on, while Adaware will run a boot-time virus scan automatically.

Let’s look at how to use Avast’s free scanner to remove viruses before the operating system starts:

• Download the program through the link above, and then install it. Watch out for any extra offers you might see during setup, like to install unrelated programs. All you really need to perform virus-cleaning functions is Avast.
• Select Protection from the left panel.
• Choose Virus Scans.

• Select OPEN NOW in the Boot-Time Scan section.

• Select the settings/gear icon at the top right to open Avast’s boot-time scan settings.

• Modify any settings as you wish. As you can see in this screenshot, you can adjust the sensitivity of the scanner, scan for potentially unwanted programs, open archives to scan inside of those, scan all the hard drives plugged in to your computer or just the system drive, and check for viruses in the programs that normally auto-start with the operating system.
  
  You can also choose what happens when a threat is found: Avast can try fixing it without deleting the file or you can choose to have the file moved into a quarantined area or simply removed.

• Press the exit button on the top left of the settings to return to the boot-time scan screen.
• Select RUN ON NEXT PC REBOOT. Also on this screen is an Install specialized definitions link that you can click to download more definitions that are supposed to help find viruses during the bootup process.

• The next time you restart your computer, Avast will scan for viruses before the operating system starts and will deal with the threats in whatever way you specified in the settings. Take note that only on the next reboot will it scan for viruses; to have it run a boot-time scan again during another reboot, just repeat these steps.

This is what it looks like during an Avast boot-time virus scan. It could take a few hours to complete depending on how many files it has to check.

Take special note of the TXT file mentioned in the Report file line. This should be the same for every computer; it’s where you can go after the OS starts to see what Avast Free Antivirus found and removed.

You can stop this scan at any time by pressing the Esc key. It will briefly tell you how many files were scanned and if any infections were found, and then your computer will reboot normally into the operating system.

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