I've managed to fix it on one PC but have the issue on another PC.. There was some Avast driver in Device Manager which was corrupt. On top of that, the install was corrupt ( a repair wouldn't work). Once I removed the driver manually and done a clean install (using online installer) it worked fine.
The only difference I see between the fixed and unworking versions is the version of the installer I used. I'll attach the logs here shortly. (of the unworking Avast)