📎 AI Summary:
The thread centers on how to clean a Windows PC infected with malware that may prevent Windows from booting, using a Ubuntu Live CD and the avast! virus scanner. A key issue discussed is that avast! lacks a proper 64-bit Live CD version, so users are advised to use a 32-bit Ubuntu Live CD (even if they have a 64-bit environment on a USB drive) to get correct scanning results. Overall sentiment is practical and reassuring, with contributors framing the method as a reliable “ready-to-fix” solution for most infections.

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U.S.Navy D.A.V.
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Getting a virus is bad. Getting a virus that causes your computer to crash when you reboot is even worse. We'll show you how to clean viruses from your computer even if you can't boot into Windows by using a virus scanner in a Ubuntu Live CD.

There are a number of virus scanners available for Ubuntu, but we've found that avast! is the best choice, with great detection rates and usability.

Unfortunately, avast! does not have a proper 64-bit version, and forcing the install does not work properly. If you want to use avast! to scan for viruses, then ensure that you have a 32-bit Ubuntu Live CD.

If you currently have a 64-bit Ubuntu Live CD on a bootable flash drive, it does not take long to wipe your flash drive and go through Link Removed again and select normal (32-bit) Ubuntu 9.10 instead of the x64 edition. For the purposes of fixing your Windows installation, the 64-bit Live CD will not provide any benefits.

Once Ubuntu 9.10 boots up, open up Firefox by clicking on its icon in the top panel.


Conclusion

Running avast! from a Ubuntu Live CD can clean the vast majority of viruses from your Windows PC. This is another reason to always have a Ubuntu Live CD ready just in case something happens to your Windows installation!
Complete Guide: Link Removed