It probably became corrupted by a partially completed update. Try running the Virtual Techician once or twice to see if it can fix it: http://mvt.mcafee.com/
If that fails to help then I suggest uninstalling in the normal manner via Control Panel > Programs, then running the MCPR cleanup tool, rebooting and reinstalling from your online account.
You can uninstall the MVT afterwards if you wish from Control Panel > Programs - just like any other programme.
why can't i click the link of mvt you gave?
Something maybe wrong with your browser as it works fine for me. Check for malware using Stinger and Malwarebytes Free or any other tools mentioned in the last link in my signature below.
If you can't click on that either something is most definitely wrong. Either try another browser or try to do a System Restore to before all this started.