No, the file deletion came afterwards. I believe I figured out the problem. It was a gap in the vista system which I researched online. It described the problem perfectly (it was not actually a blue screen as labeled, but a black screen and shut down). Apparently there will be a patched available soon, if not immediately. The problem has not occured again. Also, I am aware of particular files which are necessary for system use yet unaccessable. I knew if I deleted these even a restore would be of no use. It was the other files which I was not sure of that I tampered with. Hopefully no harm was done. If harm was done, what would be the symtoms? As of now, my system seems to be running very well. Thanks for all the help and expert advice.