Use Task Manager to Identify the Cause of the Shutdown Behavior
Use Task Manager to determine the programs that are currently running on the computer. For each program that is listed in Task Manager, manually quit the program, and then shut down and restart the computer to test if the shutdown problem is resolved. To do this, follow the procedure that is described in this section.
NOTE : All programs that are currently running on the computer may not be listed in the Applications tab of Task Manager.
Press CTRL+ALT+DELETE, and then click Task Manager .
Click the Applications tab.
In the Task column, click the program that you want to quit, and then click End Task .
Quit Task Manager.
Shut down the computer.