[gabri3l]

It's hard to diagnose the problem without the software in front of me, but you can try opening the MSI in orca and selecting the PROPERTY cell on the left hand side. Then in the cells to the right add a new row. In the new row under property type DISABLEADVTSHORTCUTS and set the value cell to 1. Then install the software.

The problem is that when a program using MSI installs it registers itself with Windows Installer Service. The service then controls certain program properties. You cannot stop a certain program from using the Repair option. However, you can disable the service all together by opening up your registry and going to HKEY_LOCAL_MACHINE\Software\Policies\Microsoft\Windows\Installer (you may have to create this folder) and Create a new DWORD value, or modify the existing value, called "DisableMSI" and set it according to 2 = disabled. Exit your registry, you may need to restart. This will almost definately fix your repairing issues. The only problem you will face is that this disables the MSI service for all applications.