Re: Keygen.exe Virus
i'd get rid of mcafee since it tends to miss a lot of stuff that's clearly obvious and it bogs your system down big time. Go with AVG free edition, avast home or avira personal edition classic all of which are free, use low resources and detect far more than mcafee.
Desktop: Dell Dimension E510, 2.5GB RAM, Intel P4 3.0GHZ, 250GB HDD, Windows Vista Premium. Might not be the best, but the old girl is still running good.