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Answer to your first question..
Do you use dial-up or are you on broadband? If your on Dial-up there really (IMO) no reason to have a firewall. But on Broadband you definitely need one..But to open all ports just turn off your firewall or uninstall it.
For your second question...
No you cannot disable SP@ without uninstalling it.. There are parts you can disable such as the firewall and security center and other things. Are you having problems with not having enough
ram?
To disable XP's firewall do this
Click on start... Click on Run..type in Msconfig...There will be a box that pop's up with some tabs on it.. go to the services tab and find "Windows Firewall/Internet Connection Sharing and untick the check mark in it..Then keep scrolling down the list and you will see security center..click that box as well.. press apply it will ask you to reboot. reboot and when windows load's again there will be a pop up saying you used Msconfig to disable services just click the box that Say's don't show this again, and there ya go
