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Many of the best antivirus providers offer a no-cost bootable recovery disk that can be used to clean your computer after it has been infected. These are essentially Linux-based software designed to clean an infected computer that won’t start or cannot be examined by a standard antivirus software program running in Windows. I suggest the Kaspersky disc for its simplicity of use (though it might not work on some Dell systems).

You can also get similar features on the Avira or ESET rescue disks, which have an interactive interface, but require the use of a USB/CD device to boot. Both of these options will search for and decipher any malware on your computer. However, their virus definitions may not be constantly updated like the Rescue Disks that are Linux-based.

The Trend Micro rescue disk is another great option and one of the smallest with a size of around 70MB. It doesn’t include a graphical user interface, but it operates quickly and offers a few options for customization, including the ability to mount and scan specific volume volumes, files and even specific folders.

You can also get an excellent virus scan from the Comodo rescue disk, but it’s not as flexible as the flexibility of the options for Linux above. However, it is an efficient tool for detecting and removing the kind of virus that can hide in Windows files to thwart detection by normal antivirus programs. You can use the text-only interface or a full-graphical interface. You can also perform a smart scan, or a custom scan.