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Not necessary. If you get one of those boot viruses which puts itself in the boot sector even after complete disk format you will still have it. But in most cases complete formatting of the hard drive and fresh installion of OS gives you virus free OS.

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16y ago

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Well, without harming your computer, i would say that everything is risky. Reinstall your Operating System, but before you reformat and reinstall the OS. Backup all your important files on CD and Email, and another computer. Once you reinstall, the virus will be completely gone, risk-free.


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