Sorry to hear you're having so many problems. You wrote you tried to set up Avast 'per instructions to stop the yest and no questions'. I take that to mean you tried setting the exclusions posted at Malwarebytes, but it didn't work for you.
I came across your thread at the Malwarebytes' forum. I see where a contributor noted he tried the same instructions (for Avast! 6) and it worked for the new version. Are you sure you followed the instructions "to the letter"?
You indicated you were displeased with AntiVir due to its lack of email scanning. ONLY some food for thought and my personal opinion. Some may disagree. I would be remiss if I didn't preface the following remark by letting you know, I'm extremely cautious when it comes to clicking on links in emails or opening attachments. I don't want (or feel I need) my A/V to scan emails.
I use AntiVir. If I need an attachment scanned, it is capable of doing it. I would invite you to read where Symantec writes (under "Is my computer still protected against viruses if I disable Email Scanning?"):
'Disabling Email Scanning does not leave you unprotected against viruses that are distributed as email attachments. Norton AntiVirus Auto-Protect scans incoming files as they are saved to your hard drive, including email and email attachments. Email Scanning is just another layer on top of this. '
I tried to find an article by Tom Koch, which I had in my bookmarks. The page now redirects to Microsoft. But it covered the same subject. This article references it. It's as close as I could come to accessing it.
I'm not trying to convince you either way. If you're comfortable with your emails being scanned, you should find an A/V that scans them. That's if you are unable to sort out your Avast! problems and plan to switch to another.
Furthered good luck..