Try this: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 scanHow to run a Full scan with Malwarebytes:
https://lbis.kenyon.edu/helpline/antivirus/malware_scanNote:If your PC does not shut down in safe mode it sounds like Malware.Good luck!