I came here because I’ve had similar problems on my laptop and desktop starting a couple of days ago after updating the Avast engine. On the laptop, everything slowed down and froze multiple times and the Finish Avast Update window popped up again and again when rebooting, even though it had said it was finished the first time I did it. On the laptop, I could not find anything using Avast and Malwarebytes. I ended up resetting it to factory settings and then installed Avast and Malwarebytes. When installing Malwarebytes, Avast popped up saying there was a rootkit infection and I had to do a boot scan, but the scan found nothing.
On the desktop, there was freezing up and the Avast Finish Update window coming back even though the update was finished. There I found win32:Ezula-AGE using Boot Scan. When I was installing Kaspersky Virus Removal Tool, Avast popped up with a message saying it blocked this threat: BV:Deleter-S [Trj].
Is there a problem with the current Avast engine update?? This is the version that keeps saying it needs to be updated: 7.0.1451
Thank you.