system
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Been along time since I ran boot time scan…I assume after POST (your BIOS F2-F12 screen), then Windows Splash that this is where boot scan comes up before login…do you recall ? …it would make sense. It sounds like Avast Boot scan is routing to the scanner then exiting because it remembers your cancel but for some reason doesn’t get out clean to the login screen…only speculating of course.
So, perhaps go ahead and re-schedule a boot-time scan and hopefully on reboot it will run…if so, let it complete.
The other option would be to do a clean uninstall…but if it was me I’d do the above first.
These scans are very slow at first then jump in percent…then slow, then jump…in other words the progress % is not symmetric over time.
I’m sure there is a easier way than all this and this is time consuming but I’m not an expert on Avast…just a Forum poster…so far from an expert…thus, any suggestions I do make I want to make sure are safe.