If you paid for a discrete sound card use it.
Unplug hd/ac97 connector from motherboard.
Plug that connector into your sound card preferably the hd one.(if it has header some don't)
Uninstall all your onboard sound files(Realtek or Via,etc...)
In add remove files and unistall the onboard drivers in device manager.
To make sure they are all gone download DriverSweeper.
Run in safemode selecting the appropriate Realtek tab,I would also dump whatever you loaded for your card.
Reinstall your audio card and appropriate drivers.
In bios disable onboard sound.
If that doesn't work you have me!
You could also try changing your audio format. Mine was defaulted to 24bit/192khz and i had crackling issues in Bad Company 2 and Dirt 2. If i remember correctly most games and even dvds/blu rays are recorded at 48khz. Anyways, to the point, after lowering my audio options to 24bit/48khz my sound issues went away. Give it a shot and let us know how it turns out. Good luck .
I will try that, but it appears the issue was a bad core. I unlocked two, and thought if the system booted, they were good. Live and learn. Games run fine on stock dual core. I will see if one of the two remaining cores is stable.
Thanks to everyone for your suggestions, they were appreciated!