I am running Windows 10 Professional 2004 64-bit. I have the free Spybot Search and Destroy installed. Is Spybot interfering with Windows Defender? Can both co-exist? The reason I ask is this: Defender is not updating its patterns; the last update was 10 days ago. On Windows 7, MSE (as Defender was called) updated once or twice a day. Also, I have a Defender full scan scheduled to run at 7 PM each Friday, but it does not run. I can run a full Defender scan manually. When I open the "Windows Security" window, it shows Spybot (and my WebRoot Secure Anywhere), but it does not show Defender. Can both co-exist in Windows 10? They both co-existed in Windows 7. Thanks.