Windows 7: Windows Explorer Crashes

I've been reading through this thread in the hopes of finding a clue as to why my win explorer crashes and restarts if I right click on any drive letter - I do this if I want to eject a usb drive, but its the same result for any drive.
Haven't a useful clue yet though. sfc/scannow doesn't report any problems.
Anyone have any suggestions?

Hi again,

I have been out of the country for a while - so havent had a chance to test things out. The story so far......

I created a new profile (as administrator) and the problem occurred on the new profile. I'm completely stumped.

Does anyone have any idea how I can identify the problem?

I have a similar problem in which I can be browsing or working from an office program with 1-2 explorer windows open and (not internet) explorer crashes. I have to go and reopen another windows but thats all. Its a hassle when working from files in different folders though.
Any ideas?