Silent Install of Acrobat Pro 7.0 fails with Error 1404

Hi,

I'm trying to silently install Acrobat Pro 7.0.

I have created the MST using the Installshield Tuner 7.0, and use the following command line to install:

msiexec /i acropro.msi TRANSFORMS=mytransform.mst /qb

I am getting the following error message:

------
Error 1404.Could not delete key
\software\Classes\CLSID\{CA8A9780-280D-11CF-A24D-444553540000}
Verify you have sufficient access to that key, or contact your support personnel.
----

If i repeat the command without the /qb, and do a manual install (msiexec /i acropro.msi TRANSFORMS=mytransform.mst), it installs without error, so the problem only exists in a silent install.

System Specs:
Windows XP SP2 with all MS patches to march 2007
Acrobat Reader 8.0
Base image created by SYSprep, and then using Altiris Rdeploy.

I'm suspecting that a MS patch has locked down that part of the registry, and the Acrobat Pro MSI doesn't have the code to handle this in a silent install.

I have opened the MSI using Wise installer Pro, and can't see anything strange in it.

Any help/pointers would be a great help

Thanks,

-Mark