Ok, nice setup btw. OK, whatever the case you should start with getting rid of those viruses. Do you have a copy of xp that you could use to reformat? That sometimes is the easiest way. However, if you have a current verion of McAfee, then i would suggest:
I. boot into safe mode (press f8 as system begins to boot and select safe mode when the option comes up)
II. Go into controlpanel>add remove programs, and remove any potential malicious programs (not always necessary but strongly suggested)
III. Run McAfee
Then mabye even restart, boot into safe mode, and run it again for good measure, see what happens. Safe mode is a diagnostic/trouble shooter mode for windows btw. So, i suggest you try that and see what happens, then go from there. Good luck.