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Thoroughly check your machine anyway. You dont even have to do anything to get an offline machine infected. Look at how the yanks developed stuxnet to infect nuclear reacts in the middle east which have zero physical connection to the outside electronic world. Many cheap chinese usb thumbdrives have infection code that automatically runs and installs the moment you plug in the drive and the code doesn't live on the "drive space" so formatting the thumbdrive wont stop it recurring. Also most "popular" virus scanners aren't looking for anything harmful to your computer data, they are paid to look for things like patches and key generators used to bypass copy protection measures. The also no longer "clean" either, they used to be able to remove computer viruses without destroying your data, these days they just delete your files along with the virus. Norton itself exhibit virus behaviour as well as questionable realibity and corporate practices, as does Mcafee and various others. I have yet to see a product to rely on that produces "false positives" you just should never get them. But hey if you want false sense of security they will happily take your money.
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