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.