If you don't have any anti-virus or anti-spyware programs you can use an online scanner from Trend Micro, called House Call.Or, you can download a free 30 day trial of Trend Micro Internet Security (PC-cillin), install and update it, then let it scan for and remove all threats it finds, rebooting as instructed.
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To do this go to Start Run and type in Regedit and press Enter.
When the Registry Editor opens there should be five items with signs listed in the left pane, each beginning with "HKEY," each representing a different branch of the Registry.
One of these solutions will probably solve your problem.
Even if you have complete and full Computer Administrator privileges and are logged onto the actual "Administrator" account, you may still have to "take ownership" of the four main branches of your Windows Registry, and/or the Windows Directory and it's files and folders, to successfully install XP SP3.
When the logon box appears type the user name: Administrator and then type in any password you have assigned to that account.