Aeclptic is right. Norton does use alot of resources and can slow your PC down, I had it but I didn't like the fact it was heavy on resources and that it didn't detect much and especially that it made my computer unstable. Go with something else, like Aecliptic said go with ZoneAlarm Security Suite instead because it's lighter and bettter. I like zone alarm and I haven't tried the security suite, i've heard great things about it.