where is your sound card in relation to your video card. are they right next to eachother?
Also, are all your sound card drivers updated?
I had hard lockups with an old version of my sbaudigy2 platinum driver, ONLY when I installed a raid controller.
never had that problem before the raid.
Just shows how picky sound card drivers are.
make sure your chipset drivers are also up to date.
if you have an intel chipset...(intel chipset installer)
look at your list of devices at boot.
you should see a list of installed hardware, each showing the IRQ assignments. If your video card, sound card, or STORAGE CONTROLLER is sharing an IRQ with any other then your problem might be that.
When I had a PCI card installed into the slot right next to my RAID controller, I ran into huge problems. the raid would not format a drive, a simple action, but otherwise looked like it was working.
its possible that your system works in non-game environments, but when the 3 (hard drive, video card, sound card) are all used in the same setting, you run into problems.
If your devices are sharing IRQ's that most likely is your problem.
Also, a simple OS reinstall helps too.(if your at your ropes end)