Hey guys, I just joined this formed for this specific reason on my pc. I have a very similar problem and I believe relates to the memory. Mine however, only happens after my pc is left on for 2+ hours. After that time period, if I have just three windows open of various applications including IE, explorer, etc. then my right click doesn't work (just like the original poster's problem). The menu simply does not appear. But as soon as I close one of those applications (and some memory is exhausted I suppose), the right click works just fine. In other words, I can really only have 1-2 apps running until I restart my computer.
Here is a screenshot of one problem that occurs after my computer is left on too long. (In Photoshop.) Also, at this point in time, my right click didn't work.
EDIT: If you didn't notice, all of the new document options are missing
Another error that sometimes appears in Photoshop is that I have insufficient memory.
I have 4gb of memory in my system (4*1gb ddr) and I am currently testing each one individually to see if the problem remains. So far I've tried two with no luck.
Any help would be appreciated.
PS - And no, running Vista has nothing to do with this because I had the same problems with XP just a few months back.