boot time scan in endless loop

Running free version, windows 10 on an IBM laptop
When I attempt to run the boot time scan, after booting at the avast free antivirus page in the middle of the screen there is a circular spinning feature which looks like it is trying to load a file. I have let it run for over 10 minutes and it does not change.
Prior to running it downloaded additional boot time scan files.
Only way out is a hard reboot by depressing the on switch for about 10 seconds.

How do I fix?
Thank you

hi,
Known issue, for now please follow the workaround procedure
https://forum.avast.com/index.php?topic=320643.msg1691671#msg1691671
https://forum.avast.com/index.php?topic=320605.msg1691681#msg1691681

Thank you it worked.

Is helpful to include this link as well since to do this you need to know how to access the geek menu.

https://support.avast.com/en-en/article/Use-Antivirus-Geek-settings/#pc

You are welcome

Is helpful to include this link as well since to do this you need to know how to access the geek menu.
That's why I put the 2nd link with the geek:area FAQ ;)