Update your audio drivers.
Thanks for that! I did a fresh install of W7, the only drivers I have are labeled as "Windows HD Audio Drivers". I can't find a way to update those, should I just download the newest Realtek Drivers? I think that's what I was using before.
I've tested my ram just to be sure, 5 passes with Memtest, is there anyway to run diagnostics on a motherboard to check for faults, if that could be the issue?