Try a new admin capable user account. Does the issue propagate into the new account?
I have an HP Q6600 desktop that runs Windows 7. It is running a little slow in general, but I am having a peculiar problem in Gmail. My cordless Logitech mouse will all of a sudden not want to open emails. I have tried different mice with no different When I first open Gmail, it does fine, but then stops working. Sometimes, if I close & reopen, it works but not always. Otherwise, I have no trouble opening anything. I can use other features like Chat if a window is open.
Any clues? Thanks.