Hi, I had the same exact problem and it seem there was a conflict with my CA Security Suite. I uninstalled it completely from the Add/Remove Programs.

Reinstalled it with:
CA Anti-Virus
CA Anti-Spyware
CA Personal Firewall
CA Anti-Spam


Excluded:
CA Parental Control
CA Website Inspector
CA Desktop DNA Migrator


I hope this will resolve your issue even if you use another Security Software suite.