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bill - 3:32 pm on Aug 29, 2009 (gmt 0)
If you can't get SP3 from there try this page: Windows XP Service Pack 3 Network Installation [microsoft.com] However, Kaled's advice above is probably best. Searching the keywords he highlighted will give you a number of sites with step by step instructions.
You should not be downloading anything from Google. Get it from Microsoft. Preferably here: [update.microsoft.com...]