Use something else then. WMP is a bloated, insecure, pile of crap IMO, and you're better off without it.
I personally like to keep my music players separate from my video players, so I use WinAmp for all my music playing needs, and MediaPlayer Classic Homecinema for my video needs. Technically either player can handle audio and video, but IMO WinAmp makes for a horrible video player, and MediaPlayer Classic makes for a horrible audio player. As an audio and video player respectively, they are among the best out there. Both able to do things that WMP users can only dream of doing.
Last week I had a notice for a virus pop up (trend micro antivirus) telling me something like MP....something was corrupted. I removed it not thinking much of it but i now realize it must have been something to do with Media Player becuase I can't get it to start. I double-click, the computer thinks for like two seconds and then nothing. I've rolled, i've reinstalled three times, ive tried going to command prompt and entering some things i read on here, but nothing seems to work. I'm running on XP. I would really appreciate any help!