To fix this problem, simply disable Windows defender
For Windows 8 & 10 -->
1. Open windows defender
2. Press "Settings" and disable Real-time protection
For Windows 7 -->
1. Open Windows defender
2. Disable Windows defender
If Windows defender does not open (says needs to be activated & wont open)
Then remove microsoft essentials anti virus, and Windows defender will open
If you need any help, you can PM me.