|This problem is caused by a hacked up HOSTS file, to find this file go Access folder C:\WINDOWS\SYSTEM32\DRIVERS\ETC Then right click and delete the "HOSTS" file.|
Also, when the shutdown timer starts try Opening the "Run" Program on the start menu, then after you do that, type "Shutdown -a" and hit enter.
After you've done that, Download install update and run both of the following:
I'd recommend running both of them in safe mode, you can enter safe mode by restarting your computer and hitting f8 repeatedly while it's starting back up. Also I'd recommend disabling System Restore, as it can harbor malicious scripts that will re-introduce the infections back into your system.
If the problem still persists after this, try checking the user STARTUP folder and the system STARTUP folder for unwanted programs in there, as this could be a simple BATCH (.bat) file infection.
Best of luck!