i would uninstall the software and download fresh from the website and reinstall if you are having problems. then i would run a deep scan on your computer with avast or some other antivirus/rootkit detection to be safe. good luck
Same thing happened to me....I fixed it by uninstalling and than re-installing the software. Some of the other sites have had some strange issues too....As for the cause, I betcha it had something to do with Tuesdays MS Windows update....just a guess.