How much RAM does your PC has? It requires 128MB of RAM if the system is XP.
Not sure if default installation matter because I've installed using Custom installation because I don't need the Parental Control feature.
What to do before installing your 2005 Symantec product
I installed Norton Internet Security 2005 and it made my PC run really slowly. I uninstalled it and my PC runs normally again. I have a laptop that came with it already installed and it runs fine there. Am I doing something wrong with the installation? I chose all the default settings. Or is there some way I can just install the anti-virus part of the software and leave out all the rest?