I had installed many times Avast on different Home PCs and laptops but recently in Win10 updated version and new versions of my lovely avast BOSD(Bad Pool Caller Error) appears!!! I realized that can’t connect to network by Mob when i connect my Blackberry by Bluetooth and cable. I uninstalled Avast then everything went true on any laptop. I disabled safe-zone, cyber capture, ransomed shield and also all avast shields, searched many times nothing helped me and my customers as a system advisor!!! I guess it is related to windows update and it’s firewall, and network adapter driver. Now I’m working on system drivers.
Have you tried a Clean Install of Avast:
https://goo.gl/4Ptzkf
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A
What exact version of avast ?
If it has a firewall, what are the exact settings ?
Yes dude, I have done one month ago but nothing helped me exception of uninstalling Avast!!!
Premier Ver: 17.6.3625.0
Avast firewall is on and it has configured as a default by Auto decide option. Then i changed it to manually network choice even changing the setting was the same as before :-[ :-[
Update to the latest version (17.7.2314): https://forum.avast.com/index.php?topic=209428.0
Tnx Asyn for new release info. I’ll be checking … 
You’re welcome.
With system net driver reset(Lan & WiFi) and updateing system drivers acompaning avast new version 17.7.3660 everything works well. if there is Other issues give the forum a massege :-*
Thanks for the feedback.