You might want to review what's new in SP2 and find out how to use them.
BTW, the link to SP2 download in one of the papers there is broken. Seems MS had it rolled back.
Some more info in below.
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microsoft
"Coming soon: Windows Service Pack 2..."
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pcmag
August 4, 2004
Windows XP Service Pack 2 released to manufacturing today after an unexpected two-day-long delay due to some unspecified issues. ...... so by the end of October, consumers will be able to buy a boxed version of Windows XP SP2.