Pondus
3
have you tested the file(s) at www.virustotal.com
running multiple AV programs can create all kind of mysterious windows errors and false positive detections
Never install two AV programs (see reply from quietman7)
http://www.bleepingcomputer.com/forums/index.php?s=7c8217673a726b92cfc91ecfd4294a29&showtopic=260844&view=findpost&p=1441638