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You can try to locate and close the software application that has stopped 
responding.

Press the Ctrl+Alt+Delete keys. The Windows Task Manager window 
appears.

From the Applications tab, locate the application that has the status message, 
“Not responding.”

Select the application that has a Not Responding status and click End Task. 
Windows attempts to close the application.

If your computer does not respond or the application does not close, try the 
following steps:

Save any open files, if possible.

Press the Alt+F4 keys. The Turn Off Computer window appears.

Click Restart.

If your computer still does not respond and you cannot restart, shut down your 
computer by pressing and holding the power button for more than six seconds.

If the software application continues to stop responding or causes your computer 
to stop responding, contact the software publisher or designated technical support 
provider.