I've read scores and scores of posts describing how to fix this issue, and I've found the following set of things to try. But I've tried every one of them, but nothing helps.
I've tried the following:
(1): I'd already completely disabled UAC (registry confirms this) - makes no difference
(2): Hold left-click & press escape - doesn't work
(3): Hold right-click & press escape - doesn't work
(4): Ctrl-Alt-Del & press escape - doesn't work
(5): Confirmed no keys are stuck on my keyboard
(6): First disable "Enable context menus and dragging and dropping", then reboot, then re-enable it, then reboot - doesn't work
(7): Uninstalled mouse and keyboard drivers, then reboot - doesn't work!
(8): Ran SFC /SCANNOW - reported NO integrity or other problems
(9): Ran Avia & SpyBot & MBAM - all reported NO malware
What do I do now? I'm completely STUCK! Please help!