AVast installs but then gives warning that it's turned off - Windows 7 Pro

I’ve had this problem now 4 or 5 times… I put AVast on all computers I work on for customers who come in with virus and malware infections, but about 2 or 3 weeks ago I started seeing this problem. The install goes normal, but then AVast never starts … if you double-click on it, it comes up in red and the TURN ON or FIX ALL options do not work. I run AVAST CLEAR in safe mode to remove it, reinstall, and same thing. I run the avast diagnostic and it comes back that everything is working fine with an error code of all Zeros.

These computers are identical to ones it works on so this makes no sense really. I’m thoroughly confused as to what is happening. Anyone have any ideas?

Thank you.

have you tried avast repair

controlpanel > ad/remove programs > avast > uninstall/change > repair option … wait a minute and reboot

Yes, I tried repair as well … nothing I can find will make it start.

Additional information:
When I run the avast! Total Support Tool, everything comes back good EXCEPT: Security Software Enabled: No Antivirus Found
The Results code is 000000

Are you sure all infections are removed?

Are previous used AV removed?

Brand new computers … only thing installed is Malwarebytes (which is installed on other ones that works just fine).
Windows Defender is turned off as well.

Brand new computers ...
and it does not have any factory installed trail AV ...like Norton / McAfee / TrendMicro ?

I have the exact same problem on Windows 7 Pro. I have uninstalled and ran the cleaner in safe mode reinstalled Avast. I get the message “You are Unprotected”. Clicking on “Resolve All” or “Start” does nothing.

If I install version 7.0.1466 or 8.0.1497, they work fine with no issues. It is only version 9.0.1501 that gives me problems.