sounds like a sound driver issue, but, try this,...
got to event viewever and look for any abnormal events, anything with the red check mark, once found look up on the net the meaning of the error.
You can also try bsod viewer. Normally there is a mini dump created at the time of the crash, you can use bsod viewer (nirsoft.com) to investigate the issue
try updating / reinstalling video / sound / monitor drivers. Let me know the outcome.
You can also post the content of the event viewer here
tks