Restart the PC and When you see the Black Screen with Press any Key to Boot from CD hit enter and let it run its routine!
When the Blue Screen is loaded,Select R to get to the Repair\Recovery Console
Hoping you dont have to use a password or the password you usually use is sufficient,let it do its thing!
Hopefully it will run and repair any damaged files!
I suppose is you have the option,you can do a System Restore to a Date before this Started!
We will just have to find all the bugs again and kill them along with who knows what else!
But it is an option!