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How to Start/Stop Security Center
Services Regedit CMD Msconfig
Services.msc:  This method shows you how to Start/Stop Security Center service from Services.msc  Perform the following steps: Please go to Start and click on the Type here to search
Locate Security Center service observe his current status and open to make changes From General tab you can Start/Stop and change the Startup type of Security Center service  To finish press ok button and close Services window Type services.msc and press Enter