It's not specific to Avast either. I tried two other pc management/tweaking solutions with embedded antivirus engine with the same result. They are 360 and Tencent, both are Chinese only so I don't think anyone here tried these. These two solutions, on installation seems fine, but dns does not work, i can ping 8.8.8.8 and the dns server's ip directly and nslookup works perfectly but pinging for example google.com or any other hostname fails. Then on restart the vm and the host crashes at the Windows 10 loading logo screen.