Ugh..error when playing video..what else is new..

http://img80.imageshack.us/img80/9967/erroroj8.jpg

Just happened in the last 30 min..didnt do anything to provoke it. How do I fix it?

EDIT: I restored two peices of "AstaKiller" spyware I had removed today and the problem is gone. Help?

Uhm, which player are u using??? have u tried installing a codec pack???
That may fix your problem.

I have a similar problem but it is only with one file that I recently downloaded. It causes an explorer error. But the strange thing is that I can play the same movie on a different computer.