Instalingl CIS fails after restart

I have one machine that refuses to accept the reinstall of the latest version Windows 7.1 64 bit

Install goes OK downloads database and after restart fails to start CIS …suggests I should use the Comodo Repair Tool…however accepting yes then nothing happens that fails to start too

I have tried to remove the current install and retried using older CIS versions all follow the same process

I notice after the fail the network will not work on the local machine until I remove CIS

Have tried Firewall standalone ditto Antivirus standalone all same result not starting after restart

Anyone any idea? Thankyou