Moved this to Malware Discussion > Home User Assistance and broke the link/removed the header for security reasons. Boot into Safe Mode by tapping F8 repeatedly while booting up. Then go to Start/All Programs/Accessories/System Tools and initiate System Restore to go back to before this all happened. Alternatively go to Start/Run and type in rstrui.exe and click OK and hit the Enter key. Not knowing your system and service pack these instructions may vary slightly. If that is successful then temporarily disable System Restore to delete the infected restore point. You will also need to update McAfee and possibly Windows too.
If that fails follow some guidelines here, possibly Malwarebytes Free (NOT Pro or the free trial) in 'Safe Mode with Networking' or the Hijackthis routine posted further down that page: