Hey I have the same problem here.
I recently formatted my computer and re-install everything without any problem. Then, after a while (I don't think I install anything before I noticed the problem) the mouse would automatically right-click in any search bars (start button, top right corner in folders, etc.).
I tried the recovery console and went back in time to erase the last changes that were made to the system, I did multiple scan of the computer with Avast, Spy-bot, Ad-Aware, etc. with no luck. Anybody have figure this out yet ?