Do you use an Intel CPU?
If yes, try this workaround:
bcdedit /set disabledynamictick yes
It was posted by a MSFT employee:
http://answers.microsoft.com/en-us/windows/forum/windows_8-performance/hang-after-beep/a0903d3e-b2e3-4286-95e6-8d6f16631c1d
"A programmer is just a tool which converts caffeine into code"