This Happened After An Update That said You needed The Update And It was Incompatible With You hardware. Go To Device manager And Roll back The Audio Driver To The Driver before he Most Current. And manually Change it back To The Other Driver. Hopefully This will Solve Your Problem. That has Happened to me on Many Different Computers unning Vista, XP Pro And XP Pro 64. It Is Most Likey Conextent.
Hopt This Helps
Turn Off the computer, now as soon as you hit the power button, keep on holding "Alt" key & keep on tapping "F10 key,ie: Alt+F10, it will open the recovery console ,select full factory restore and follow on screen instruction. (Note:this will erase all datas on the computer)
or
During the boot process you will see on the screen to press a certain key to enter setup
Press and hold that key during the boot up process to enter BIOS you can load failsafe defaults or load optimized defaults ,press escape then press f10 to save to cmos to restart
Hope this helps
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