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.
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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.
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.
atf3docAuthor Commented:
Your second post instructions did the trick. Thanks!!
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