I have Avast 4.8 Antivirus,and Antimalwarebites,and Superantispyware.com for on demand scanners.I have Comodo Pro 184.108.40.2068 for my firewall. I have tried the update process offered with in the program but it just goes on forever like it is updateing but is not. I do not want to use the Anti virus of Comodo at this time so I have not updated. Is it nessary to update,it will still protect me from intrusions and port scans,correct? I am also behind a Nat firewall from a Linksys router (wired). Just looking for a opinion?