I had that error come up but I thought it was because I removed a program and left traces of it behind. I got the error each time I tried to open up programs. They opened anyway. A technician thought it was a relatively benign virus and recommended I run a virus scan in "safe" mode. I did. The error continued. Because I was giving that computer to my brother, I ended up having the Windows software reloaded and that fixed the problem. It never kept me from getting on the Internet or using my equipment...just gave me the same error message for everything except Poser (go figure), including Scan Disk and Defrag.