|Sounds like Hitman Pro messed up somehow, so it all depends on whether you are happy to un-install it. If so you could do so from "Control Panel > Programs and features".|
If that doesn't help and if Hitman Pro was installed fairly recently you could try System Restore to a date before it was put in. Search for System Restore from start orb then follow the prompts.
Always pop back and let us know the outcome - thanks