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I regularly used parametric 2.0 on my windows 8 machine without any problems. Ever since it updated to windows 8.1, creo opens but then immediately restarts my computer when I try to open a part or assembly. I updated Creo 2.0 to the M120 version and nothing has changed. It never did this before I updated to win 8.1, and M120 hasn't helped at all. Somebody please help.