The main difference is SP1 blocks out going attemps .and SP2 blocks them both ways ,
My opinon is if you have a good firewall and good Virus protection you don't need either SP1 or SP2 installed on you computer ,but if you want an updated winxp then SP2 is just that, a winxp OS upgrade ,and like any of the windows OS upgrades ,its best done on a fresh install ,that is why it has so many problems when people are installing it long after the orginal install of winxp.
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