HJT Log and Major issues with virus(es)

Please help!!!! My computer has been encountering various issues, the most severe has been the uninstalling of all installed printers. The issue first occured when we were not able to print using our photo printer, shortly after the photo editor application would be force closed everytime the "Print" button was clicked. Now all printers have been uninstalled without our doing. McAfee occassionally finds PrcViewer but cannot fully delete it.

Last scan came up with three detections (the two cookies were automatically deleted):
Cookie-Advertising
Cookie-Insightexpres
PrcViewer


HJT log:

Logfile of Trend Micro HijackThis v2.0.2
Scan saved at 12:20:42 PM, on 3/21/2008
Platform: Windows XP SP2 (WinNT 5.01.2600)
MSIE: Internet Explorer v7.00 (7.00.6000.16608)
Boot mode: Normal

 

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