Well I've just encounter this problem, the thing is that at the moment only with players like windows media player and real media player don't want to open when I open them it just says to me that there is an error and I have to close them, it happened just right now, and like I said at the moment only with the players. I've already made a scan wih ad-aware and zonealarm and nothing is found. I hope I won't have further problems.
I made a scan with hijackthis, hope it helps.
My beloved compy :P
OS: Windows XP Home Edition SP2
Mobo: ASUS A8N-SLI Premium Socket 939
CPU: AMD Athlon X2 3800+
RAM: 2Gigs (2x1gig)
Video Card: Nvidia GeForce 7900GTX
PSU: Acteck Gaming Switching 500 Watts
Hard Drive: Samsung 300GB
Moniter: Dell 17" Ultrasharp (1280x1024)
Disk Drives: DVD-R, CD-RW
Case: Acteck Aurora XP