XP Sound Windows Media Player

I have upgraded to xp. When I upraged I did a clean install. I have almost 2 gigs of mp3s, shhhh dont tell the recording industry, I backed them up to my old pc via my network. When I copied them over some of them sounded bad in the Windows Media player. However, winamp will most of them fine. I got on my old pc and I can play them over the network and they sound fine in ME. Is there anything I can do for this?

Thanks

 

problem solved it was the graphics card thing. Need a good agp card