If the ram checks out, the next step that I would do is to try is to run a "chkdsk /r" I've seen a bad sector on the hd get randomly hit because of swap file usage usually causing lockups or blue screens (usually blue screens tho). Either way once you fix the ram, it's not a bad idea to let windows check out the files (especially the system files) to ttry to fix up the system without doing another reinstall.
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