It doesn't seem to matter what kind of data I cut and paste.. I think the problem is also there with copying, and I've seen it for deleting items.. My thought would automatically go towards the file system, but since it also happens when I right click, I'm unsure. The right clicking doesn't even have to be on files. I've seen it happen when right clicking my desktop, or the "My computer" icon. It also likes to happen often when I'm right clicking things in the start menu.
As I said, it's extremely random, which is the thing that intrigues me the most. Sometimes I can do it twice in a row, and then I can right click 30 times to try to reproduce it, and I can't. Sometimes it will happen almost every 5 clicks, and sometimes I can go for a week without seeing the error.. I've tried to find a relation between when it happens and when it doesn't, and I can't find any at all. No specific software seems to be causing it.
I run spybot and ad-aware almost weekly, and since this is an ongoing problem, I'm quite certain that if spyware were to blame, it certainly isn't something those 2 programs can find..
I also ran a virus check last week.. nothing.
What does sfc /scannow do?