It is easy to remove virus alert from Microsoft. But when you try to go online, it can't be removed. If you force close your web browser and then go to Control Panel > Uninstall a program and remove the malicious app. Next, go to Settings > Virus & threat protection and click Quick Scan. Close your web browser and open it again. The virus alert has been removed and you can now go online in safety."
https://www.myquery.co.uk/remove-virus-alerts-from-windows-pc/
