With a clean install of win8.1 I'm getting numerous errors and warnings in event editor. I don't have any startup programs and have a tvtuner prog on while websurfing. Every hour on the hour I get these 500 and 501 warnings: The Desktop Window Manager is experiencing heavy resource contention. Reason:CPU resources are over-utilized. Diagnosis:A sharp degradation in Desktop Window Manager responsiveness was observed. This is my third re-install of 8.1 to check to see what I might have done wrong. It's the same every time. I put my old win8 image back and those eventIDs are not there when running two programs. I'm using a quad core cpu, and taskmanager is @16% CPU. I'm not experiencing a noticeable performance hit, I only noticed it because I was experiencing a super slow cold boot in 8.1 and checked the event editor and found the 501 events. With less startups programs 8.1 is booting slower, too. Event editor doesn't give me a clue what the startup issues might be. Google has some info on the 500 and 501 events but they refer to the the other 500-501 errors about video cards, and my 501 error is about cpu performance. Any ideas appreciated, thanks jmacie p.s. it's all optimized and defragged.