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There is not a separate product key for SP3. As long as you are running a valid copy of XP you can install SP3 on it. If you do not have a valid product key for XP, you need to contact Microsoft to obtain one.

If there is some kind of virus, you need to run an AV detection and removal tool BEFORE upgrading to SP3 to prevent further infection of the sytem. There are free products out there such as Avast!, AVG and others. Check www.docnload.com for other options.

Run windows update and you will get it

Goto http://www.microsoft.com/windows/products/windowsxp/sp3/default.mspx

and then click on "Download Windows XP SP3 now from Windows Update" and then install it and you will be good to go !