if it came with a diagnostic program? The Compaq's that I used to buy came with some good diag software. If no diags, I would start

looking at the ram first.

It looks like its some sort of a processor issue, which is a pain in the ass to try and fix.

I'm using the brand new i7 processor, and it looks like Windows isn't switcching between processors quite right... Or maybe a heat thing

I'm hoping heat, and just installed software that constantly overlays heat and voltages over the screen