PC Problems - Help!

I'm having issues with my computer suddenly becoming very slow, including programs becoming non-responsive. There is also an issue with the sound when this happens - sound is stuttering/skipping. It seems when I reboot, computer does not shut down. BSOD sometimes appears with the following error: Kernel_Inpage_Error. The issue sometimes happens as soon as computer is booted up, or sometimes not for days at a time.

My specs:

I5 2500k, ASUS P67 Pro, GTX570, 8GB RAM

I've run disk check, defragmented, cleaned out the PC, updated graphics drivers, RAM test for 6 passes, CPU stress test for over 12 hours, and hard drive check (which found 36 errors) using Ultimate Boot Disk.

I'm not positive it was just the hard drive causing the issue - is there anything else I can check.

Anyone? Could a bad graphics card cause audio stuttering?

Backup and wipe the hard drive completely, then reinstall Windows.

Not enough information. Backup your data and re image or format/reinstall Windows.

That drive is probably toast. The BSOD indicates a problem when working within the page file on the local disk.

Kernel_Inpage_Error usually means something is wrong with your hard disk. I would start backing up your essential data ASAP.

You could try repairing bad sectors on your hard disk: http://answers.microsoft.com/en-us/windows/forum/windows_7-system/blue-screen-with-this-error-code/03276fa2-6dcb-44d0-a778-499d5d00b65d