Hi Comder. I'm Greg, an installation specialist and 9 year Windows MVP here to help you.
No expert in Forums where we see the most cases (by the thousands) recommends Avast, AVG. Norton or McAfee, but we have solved many problems over the years by having them uninstalled.
I would uninstall any 3rd party antivirus and try running only built-in Defender which gives adequate protection, least issues, and is from Microsoft who knows how to protect their OS best.
If you want the best on-demand scanner install and run a full scan with Malwarebytes free scanner: https://www.malwarebytes.com/mwb-download/
You can turn off the free trial at any time in the app's Settings > Account Details.
I hope this helps. Feel free to ask back any questions and keep me posted. If you'll wait to rate whether my post helped you, I will keep working with you until it's resolved.
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