Looking to fix and start over....

Uninstalled bittorrent then reinstalled and now it's fine...weird. Anyway, when i try to play a video_ts file in media player or media center, it says my video card or driver are not compatible with windows media. Anyone know how to fix this? I cant seem to find a driver that relates and I dont know how to determine which video card I have. It all worked before reformating by the way.