Video playback Problems with SN95G5 V2

My SN95G5 V2 has been working fine with video playback until yesterday. Once any type of video file is played the system slows down to a snails pace and has to be reset. I have tryed removing various software and codecs with no success. The only way i can get a video to play is to uninstall the driver for my Geforce 6200 card and then all types of video playback ok. I have tried installing new nvidia drivers, old nvidia drivers, the original nvidia driver but with no success.

Does anyone have any ideas as to what the problem could be? The only other thing i can think of is to try the latest bios for the mobo.