system
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Ok, so I did all that - issue still remains 
I found in safe mode that i couldn’t use avastclear.exe as there was no install folder after running the uninstaller from ‘Uninstall a program’ in control panel.
Avast says ‘Attentions Firewall is off: Turn on’. When i turn it on i get told ‘Unable to start firewall’. Ive tried turning the windows firewall on and off with no progress.