Cannot Install SQL Server 2005 on Windows Server 2008

I am trying to install MS SQL Server 2005 on Windows Server 2008 x64 SP2, and the installer fails at the beginning of the install (Microsoft SQL Native Client) with the message :-

MSI (s) (BC:08) [11:46:41:405]: Product: Microsoft SQL Server Native Client -- Error 1719. The Windows Installer Service could not be accessed. This can occur if you are running Windows in safe mode, or if the Windows Installer is not correctly installed. Contact your support personnel for assistance.

I can confirm that the the server is not in safe mode, and that the Windows Installer service is on Manual and started. I have attempted to unregister/reregister windows installer using the recommended procedure:-
%windir%\system32\msiexec.exe /unregister
%windir%\system32\msiexec.exe /regserver
%windir%\syswow64\msiexec.exe /unregister
%windir%\syswow64\msiexec.exe /regserver
and rebooted the server. No change.

Another kb article suggested renaming the msi.dll's and reinstalling Windows Installer. I have remotely logged onto the server using the Administrator account in RDP (the server is at a remote site) and note that the required files in Windows\System32 have only Read & Execute and Read permissions, and the Oo/s won't allow me to modify the permissions so I can rename them.  Since I am new to Windows Server 2008 security, I don't know how to change the policy settings to allow this.

If anyone can help with any of these items, I would be very grateful.
cwruckAsked:
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Vadim RappCommented:
check the ideas in this thread:
http:Q_26395673.html
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cwruckAuthor Commented:
I tried all those suggestions already - none helped.
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cwruckAuthor Commented:
Thanks to those who responded.  We managed to fix the problem as follows:-

The version of Windows Installer 4.5 installed with Windows Server 2008 SP2 was damaged.  We were able to rename the files:-
%windir%\system32\msi.dll, msi_dll.old
%windir%\system32\msiexec.exe, msiexec_exe.old
%windir%\system32\msihnd.dll,msihnd_dll.old
%windir%\syswow64\msi.dll,msi_dll.old
%windir%\syswow64\msiexec.exe,msiexec_exe.old
%windir%\syswow64\msihnd.dll,msihnd_dll.old

after turning UAC off, taking ownership of the files as Administrator, and setting write access to the files We then requested, download and installed the hot fix from Microsoft at http://support.microsoft.com/kb/981929. This installed a later, patched and working version of Windows Installer 4.5.  We were then able to install SQL Server 2005 successfully.

I hope this solution helps someone else.
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