what os? the network access manager doesnt work under vista afaik, was a pain in the arse on xp, does ur router have a firewall? if so you really dont need another firewall anyway and NAM is just the front end for the nvidia hardware firewall built into the chipset. if ur router has a hardware firewall (my netgear has) then dont bother with NAM.
intel i7 3770k @4.4, ASRock Z77 Extreme 4, 16GB Corsiar Vengance 1600 ram, ATI 5850 BE, Antec 1 Case, Antec 1 550W PSU, emu0404, 120gb agility3 ssd OS, 2x60gbvertex2raid0 Games, 3 TB total sata2 Data. win7 x64.