XP SP3 install fails with "access in denied'

Part of Windows XP patches, I want to install SP3. It fails with message "access is denied'.
The sccpack.log file has the message "DoRegistryUpdates failed"
Per MS KB article 949377, there can be two reasons - my antivirus is running or my registry needs to be fixed.
Two questions -
1. I cannot disable McAfee as it does not have the option to disable. I tried to "end program" most of the McAfee processes but it still remained. Before I try any registry corrections for permissions, I want to eliminate this possibility. Thoughts of how to end all McAfee programs?
2. The solution by MS in this article 949377 to reset registry and file permissions - I have to download subinacl.exe and write some code in notepad.

cd /d "%ProgramFiles%\Windows Resource Kits\Tools"
subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=administrators=f /grant=system=f
subinacl /subdirectories %SystemDrive% /grant=administrators=f /grant=system=f
subinacl /subdirectories %windir%\*.* /grant=administrators=f /grant=system=f
secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose

Any concerns with that?

Thank you
atul021497Asked:
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marsiliesCommented:
How to disable McAffee VirusScan:
http://forums.mcafeehelp.com/showthread.php?t=213892
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DatedmanCommented:
McAffee doesn't really disable completely when you do that.  I prefer removing it entirely (forever lol)
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WaynepreCommented:
I would try installing with local administrator rights. In local Admin you should be able to go into the McAffee console and disable the scanner.

You will also be able to install any updates required.
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atul021497Author Commented:
My goal is to install XP SP3. The error I get when I do that is "access is denied". The user that I am logged in as in an administrator. Microsoft says disabling will be sufficient. I attempted install again with disabled McAfee, it failed.
Note that as part of the installation process when the wizard is trying to take registry backup, I do get multiple messages "Service Pack 3 setup could not backup registry key ...".
So perhaps it is less about McAfee and more about the registry. If that is correct, please review my second questions about the code that Microsoft has given to reset registry and file permissions

Thanks
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DatedmanCommented:
Don't "write" the code in notepad, paste it. :)
(Sorry, I'm a little dopey from a deep scuba dive I'm sure you knew that heh.)
That's fine to run ofc, it's from a microsoft KB right?
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atul021497Author Commented:
Yes sir, I will not "write", I will paste it. and Yes, it is directly from Microsoft's KB article.
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orangutangCommented:
subinacl should fix it.
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