I haven't had any issues with NIS2009 and it certainly isn't a resource hog on my system.FYI Norton Internet Security it's a piece of junk software. I would use AVG anytime instead. I am currently running TrendMicro without issues. AVG also runs great on RC1. Symantec and McAfee are memory hogs.
I haven't had any issues with NIS2009 and it certainly isn't a resource hog on my system.