Reboot you PC into SAFE WITH NETWORKING
To get into the Windows 2000 and XP Safe mode, as the computer is booting press and hold your "F8 Key" which should bring up the "Windows Advanced Options Menu".Use your arrow keys
to move to "Safe Mode With Networking" and press your Enter key.
To get into the Windows Vista and Windows 7 Safe Mode With Networking, as the computer is booting press and hold your "F8 Key" which should bring up the "Windows Advanced Options Menu"Use your arrow keys
to move to "Safe Mode WithNetworking" and press your Enter key.
Log into the Administrator account(password may be rquired
Once you're in Safe mode with networking download:rkill.exe
save to your desktop and double click.A command prompt window will flash and its done.
Then download Malwarbytes: http://www.bleepingcomputer.com/download/malwarebytes-anti-malware/dl/7/
Once Malwarebytes has been installed run a full scan
How to run a Full scan with Malwarebytes:https://lbis.kenyon.edu/helpline/antivirus/malware_scan
If your PC does not shut down in safe mode it sounds like Malware.