Following BT instructions. I removed McAfee. Installed Norton but there was a message "auto-protect" not fixed. Contacted chat line and they advices to remove Norton and reinstall. This produced the same outcome "auto-protect" not fixed. Therefore ran a quick scan. 5 hours later still running with no indication of when it would finish. Removed Norton and restored Windows security, but not sure how good windows security is? Advice appreciated.
I use Kaspersky and have never had any problems with it, plus the portal gives you a lot more information and allows you to lock and locate lost devices. I tried the Norton offering, but I had several problems with it, so gave up.
Microsoft security program now gets consistently good reviews. If you do an Internet search you can check for your self.
see links
Microsoft Defender Antivirus Review | Trusted Reviews
Is Microsoft Defender the Best Antivirus for Your PC in 2021? (makeuseof.com)