I have recently installed a nvidia geforce 6200 graphics card(256bit,256mb) on my pc.since then I can run every games and other applications smoothly except windows media player for watching movies, though my pc can run windows media player for mp3 and audio cds.I have tried other media players like power dvd but when it comes to reading any video files,these media players simply halt to perform giving a 'not responding' message.my configuration is: winxp(sp2),512mb ram,p4 2.4ghz,asprock motherboard.Before installing video card,my pc could run media player smoothly.Please help.