As I had a few moments inbetween work, I reran ComboFix, but only as far as the message "You are infected with Rootkit.ZeroAccess! It has inserted itself into the tcp/ip stack. This is a particularly difficult infection. If for any reason that you’re unable to connect to the internet after running ComboFix, reboot once and see if that fixes it. If it's not fixed, run ComboFix one more time".

Whichleads me to suspect that the Trojan has remnants behind! What I don't understand, is why can ComboFix detect the Trojan but cannot clean it?