Norton Security Suite and Immunet on same system

Comcast has started sending out bot notifications (to "infected users") via their Constant Guard program.  One of their suggestions is to run Immunet  which can be found here:

 

http://www.immunet.com/free/features/index.html

 

The feature section says it provides real-time protection and is compatable with all AV programs.

 

This goes against everything I have learned int he past in reguards to "other real-time protection" and Anti Virus running alongside Norton.

 

Does anyopne have any experience with this Immunet program?

 

If in fact it is a no no to run it with Norton - then why does Comcast recommend it's use in the same Constant Guard Do-it-Yourself clean-up as it recommends to also install and run Norton.  The instructions can be found here by clicking on The Windows Button.  https://constantguard.comcast.net/

 

Please someone, help me see the light/wisdom of this situation.

 

Thanks in advance for any response.