XP SP1 will not install "Access is Denied"

message from Erin on 4 Jun 2004

Copied file: C:\WINNT\System32\pidgen.dll
***
Num Ticks for Copying files : 567421

INF_REGISTRY Failed
***
Access is denied.

Service Pack 1 installation did not complete.

Select 'OK' to undo the changes that have been made, or select 'Cancel' to
quit. If you select 'Cancel', your system will be left in a partially
updated state and may not work correctly.
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Starting process: C:\WINNT\$NtServicePackUninstall$\spuninst\spuninst.exe
/~ -u
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I have tried uninstalling software, changing my permissions (which all
seemed to be at full control in the first place) but nothing seems to be
working.

I am installing sp1 off of a network install file located on the local
machine. I have had success using this file to update other machines. This
is an upgrade from Windows 2000. I have tried installing from safe mode,
and get the same error.

Erin replied to Erin on 4 Jun 2004

Yes, I am logged on as the administrator. I have checked the permissions
listed by the Windows help files and they are set to full control.

C:\WINNT\$NtServicePackUninstall$\spuninst\spuninst.exe

Archived message: XP SP1 will not install "Access is Denied" (Microsoft WinXP)