avast refuses to scan

[Decop]

Hello !

Installation Avast OK = protected computer.

When I run the program it comes a blank screen = impossible scanner.

1 agent is not active = passive mode because second antivirus says Avast.

I do not have any other antivirus programs installed

I disabled Windows Defender.

My Acer Aspire 7250 probably has a Shredder64.msi virus that causes the error 1706.

I deleted all the registry keys for Egistec and Shredder = I do not have the error message anymore, but Avast (reinstalled twice) launches and stays with the empty window (white Avast screen).

Solution?

thank you for your collaboration

[Pondus]

See here  >>  https://forum.avast.com/index.php?topic=194892.0

scroll down to second picture <Farbar Recovery Scan Tool>
Follow instructions and attach the two diagnostic logs here in this topic

How to attach instructions are found in same guide

[Decop]

Hello Pondus !
thank you for your reply
my friend was in a hurry and we installed another AVIRA antivirus instead AVAST.
We could run a scan = no virus!
My friend left with his computer, but I see (too late) that Farbar Recovery shows anomalies!
There is still a key Egis Tech (suspect) in the registry and .. also anomalies with AVIRA !?!?
Damn! no way to fix.
Have a good day

[Pondus]

Damn! no way to fix.

If you want help, attach the requested logs

you have only  attached one log, frst.txt is missing