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Weren't you the one, who told me that I didn't have to re-install Windows 8? If so, you were right. I backed up everything in anticipation of doing it, but now, I will just see how everything works.
Recently, I was having trouble with my Cyberlink PowerDVD Ultra 13, showing an error message every time I tried to play a movie. I traced it back to the NVIDIA drivers. Even though, I had installed the latest driver, all the old drivers still remained, even though they weren't visible. When I removed all the old drivers. Cyberlink played flawlessly, but that was only after I restarted the system. If I came in on a cold boot, I still got the same errors, both for Cyberlink and Geforce Experience. Now, since I have installed the new motherboard and I5 processor, everything works perfectly, even with a cold boot. I would say that maybe my motherboard or Q9400 processor were causing all the issues. I figure the board or CPU was getting ready for catastrophic failure.