Try uninstalling Flashplayer using the Adobe uninstaller:

http://www.adobe.com/support/flashpl...ml#uninstaller

Dowload the uninstaller then, make sure all IE windows are closed and run it.

Then, I'd do a PC re-boot (not always necessary...), go back to the above link, and re-download Flashplayer (link at top of page) and see if that cures it.