XP Service Pack 2 installation problem

TRYING TO INSTALL Windows XP Service Pack 2 I get the following error:
Service Pack 2 Setup Error...Service Pack 2 could not back up registry key HKLM\system\CurrentControlSet\Services\MSIServer to file C:\Windows\$NTServicePackUninstall$\reg01543.  5:Access Denied

The machine is a Sony Vaio w/Media Center Edition Service Pack 1

I have just finished removing quite a bit of malware...have run chkdsk /r and it repaired some bad sectors.
I have run Norton WinDoctor...and Registry Mechanic....they found some errors and repaired but still have this problem..
Thanks for any input.
atf3doc
atf3docAsked:
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accrainConnect With a Mentor Commented:
Actually on second thought try this one out, http://support.moonpoint.com/os/windows/xp/xpsp2-install-problems. Sorry about that, hope this helps.
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accrainCommented:
The registry key(s) that your error log points to needs to have admin and system permissions to be backed up properly. This MCSE newsgroup article has a very good walkthrough for solving this issue, http://www.mcse.ms/showthread.php?t=1002020.
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atf3docAuthor Commented:
accrain
Your second post instructions did the trick. Thanks!!
atf3doc
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