KAV5 + Norton firewall = bad combo

Hi,
After been testing KAV5, I´ve seen that trying to access to my pop3 mail is imposible. The problem is in using Norton IS 2004 only firewall, both processes KAV and Norton firewall grows and grows, and I need to shut down some one of them. Using sys res Kav 5 seems good, not so high, but I´ve this problem now. Anyone has experienced this issue ?
BTW, I´ve added KAV5 .exe´s to program´s control in Norton Firewall, so I think there should not be problems with this.
Gonna report it to Kav devs, and gonna back to NOD32 as on access-scanner.

Thanks in advance.

backfolder.-