Malwarebytes isn’t an AV and has been built to run alongside/compliment anti-virus programs, Malwarebytes will also give preference to an AV program in the case of a detection to eliminate discrepancies.
Followed a couple of red herrings suggested by Avast support. (uninstall “Malwarebytes” among other things)
Performed a Boot scan (as suggested). This found a couple of Java viruses that were promptly removed. (don’t know why they weren’t detected earlier).
The first couple of times I subsequently restarted the PC, it was still at 25%. Then yesterday when I was preparing to follow their next suggestion (try latest beta version of Avast) I found it was down to 0% again! And it is still at 0% today.
Yipee! Not sure what actually fixed it in the end but all is well again. Could be a combination of Avast updates and getting rid of those pesky little viruses!?
See below link for more detail:
https://support.avast.com/support/tickets/144937
Glad your problem is solved.
The link to the support ticket may work for you, it doesn’t work for us. 