What do you mean? You bumped an old topic. What version of CIS are you using?
Old in you opinion. Still very current from my view point 
I’m using the latest version and, even though Comodo as followed my suggestion and implemented a manual proxy configuration, I’m still unable to update the antivirus UNLESS I change the COMODO Internet Security Helper Service log on user to my current user.
Too bad! 
~/gnfpt
Then I think you are running Windows in Limited User mode. Is that a correct assumption?
No, it’s not. I’m running as an Admin.
If that was the case, switching the service user to my user wouldn’t make any difference, would it?
~/gnfpt