Hi welcome to the forum.
It is possible that with downloading MO/07 plus all the updates that either a corrupt file or update upset the system.
Before e go further, could you please try a clean boot How to troubleshoot a problem by performing a clean boot in Windows Vista or in Windows 7
If that does not work, could you do the following:-
First, to assist in the elimination of possible virus and/or malware.
I would ask you to please use your Anti-virus full scan program facilities, making sure, you have updated the software first. Please advise us of the results.
If you do not have any anti-virus loaded please go to this link and download Microsoft Security Essentials :- Microsoft Security Essentials | Protect against viruses, spyware, and other malware
Secondly, please download:- malwarebytes Malwarebytes
a Malware searching program, again, an updated full scan. Notify results please. Both these programs are Freeware