1) RMB on the 'My Computer' icon and choose 'properties'
2) device management
3) open tab 'control for audio, video and games'
4) search your sound driver
5) RMB and uninstall the driver
6) press the 'actions' tab and press 'look for hardware changes'
I usually do not recommend this, but if your sound driver is f**ked anyway, just try it.
