Anti Virus,
See if this applies:
1. Press Windows Key + R and then type "gpedit.msc". Press "Enter" and click "OK".
2. From the Computer Configuration tree, expand the Administrative Templates and then expand Windows Components.
3. Click Windows Defender.
4. You will see a list of settings. Make sure that "Turn off Windows Defender" is set to "Disabled" and click "Ok".
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How to start Windows Defender automatically on startup
See if this applies:
1. Press Windows Key + R and then type "gpedit.msc". Press "Enter" and click "OK".
2. From the Computer Configuration tree, expand the Administrative Templates and then expand Windows Components.
3. Click Windows Defender.
4. You will see a list of settings. Make sure that "Turn off Windows Defender" is set to "Disabled" and click "Ok".
(If this post was Helpful ("Vote as Helpful") or Answered("Mark as Answer") your question, please click the corresponding button to help others find the answer faster. For that matter, if you feel somebody else was helpful, mark them too. Also, If you have any other feedback please let us know.)