It could be a problem with ur sound card drivers then, try removing the card and c wot happens. Thats if uve got 1 it my have onboard sound on the mother board.
Try getting the latest drivers for ur mother too,
The graphic card u have should be good enough if u can get it to work

Try here http://knifeedge.infopop.net/2/OpenT...64&f=917098864

If all else fails u will have to call technical support.(or just call em first probably alot easier)

Good luck