Boofhead. It was working, after you rolled back, and now it isn't. What did you do in the intervening period?
Your hard drive
may have been failing (did you buy the new hard drive from the person who told you the old one needed replacing?) but I suspect that you were sold a dummy. Put the old drive back into the PC, enable SMART monitoring in your BIOS if not already there and then use Windows to check the drive. It will tell you if indeed the drive is failing or simply has some bad sectors (which is normal).
the part that ran the sound was bad
I'm afraid that is BS. There is a remote possibility that a failing hard drive could corrupt the cards' driver but that would not cause the problems you describe. It is also remotely possible that when you cloned the drive, the corruption was also cloned. You can eliminate this easily by uninstalling the card in device manager and select "delete driver files". Then scan for new hardware. The drivers will be reinstalled.