Virtool detected

Hi, I uninstalled AVG at the end of my contract, and straight away, Windows Defender detected the following threat :

Virtool:32/DefenderTamperingRestore 

Does anyone know why this could be, and is there anything I can do? I've run defenders full scan offline, but it can't seem to remove it.

Hello Jane, 
Thank you for contacting AVG Community Support.
We understand that after uninstalling AVG, windows defender detected a threat.
We are really sorry to know this. We'll certainly check and help you out.
Could you please let us know if you have performed the scan with AVG Antivirus before? 
Also please do reinstall AVG Free AntiVirus and let us know if you detect the same threat.
It may also help us to diagnose the issue you are experiencing if you can attach a screenshot of the problem. If you are not sure how to make a screenshot on your device, please find instructions for a variety of devices here: https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home (https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home)
Awaiting for your response.

Hello Jane, 
Thank you for contacting AVG Community Support.
We understand that after uninstalling AVG, windows defender detected a threat.
We are really sorry to know this. We'll certainly check and help you out.
Could you please let us know if you have performed the scan with AVG Antivirus before? 
Also please do reinstall AVG Free AntiVirus and let us know if you detect the same threat.
It may also help us to diagnose the issue you are experiencing if you can attach a screenshot of the problem. If you are not sure how to make a screenshot on your device, please find instructions for a variety of devices here: | AVG (https://support.avg.com/SupportArticleView?l=en&urlName=avg-create-screenshot&q=screenshot&supportType=home)
Awaiting for your response.