Originally Posted by Martel

Google for memtest, download the ISO, and burn it out to a CD. Then let it run on your system for a few hours and you'll find out for sure if your RAM is having issues. I would doubt that just a little tweaking like that could kill your RAM, but if it was kinda faulty to begin with that may have pushed it over the edge.

Random bluescreens and errors installing windows almost always point to bad RAM in my experience.