Windows defender won't activate

Having a problem getting windows defender to turn on....whenever I click on the windows defender icon, a message reads that "service is turned off "... Message also gives the option to turn it on...but still will not activate.....

I need this service on for obvious reasons, and want it to run continuously with current updates.....any ideas on how to correct this problem?

Thanks.....rocknroller...

 

Also if you are using Microsoft Security Essentials, the Windows Defender won't start.

 

i do agree. And i came to know from microsoft website that MSE is all one packege so if you are using MSE; there is no need to imstall Defender.

 

Thanks guys.....I didn't think about the MSE package running but that is exactly what has happened.....PROBLEM SOLVED.....you guys are the greatest!!!

rocknroller....