Hi,
All is looking good. Let me know if you still receive notification from AVG after this next step.
- Click Start then Run
- Now type Combofix /u in the runbox and click OK. Notice the space between the Combofix and the /

This will uninstall ComboFix. It will also implement some cleanup procedures and reset System Restore to prevent reinfection from old restore points.
Have a look at the excellent information and tips on the prevention of malware
here by a colleague of ours.