Error trying to install extension

Discussion created by eturn69 on Jun 16, 2010
Latest reply on Jun 21, 2010 by eturn69
We are running ArcMap 9.3.1, upgraded from 9.3.

When I try to install the Maplex extension, I get the following in the log file:

MSI (s) (58:54) [09:10:07:822]: Final Patch Application Order:
MSI (s) (58:54) [09:10:07:822]: Other Patches:
MSI (s) (58:54) [09:10:07:822]: Unknown\Absent: {D90B15CE-AE7E-44B3-AB85-26A2199D32B3} -
MSI (s) (58:54) [09:10:07:822]: Unknown\Absent: {60F10C6A-32CB-489C-B041-B6D52BDCFCFD} -
MSI (s) (58:54) [09:10:07:822]: Unknown\Absent: {833E15C8-6217-405B-9F02-C2FC8823C142} -
MSI (s) (58:54) [09:10:07:822]: Product: ArcGIS Desktop -- Configuration failed.

Another version of this product is already installed. Installation of this version cannot continue. To configure or remove the existing version of this product, use Add/Remove Programs on the Control Panel.

Using Add/Remove Programs gives the same error. I think this may be caused by our installation sequence for 9.3.1.
The setup.msi and setup.exe files may be from 9.3 and we upgraded using the .msp file for 9.3.1.

Any ideas short of complete uninstall/reinstall?