Add/Remove program problem

[rayc]

I'm trying to upgrade a very old application and I'm using NSIS to create my installer. The problem I'm currently having is that after I run my installer, the old version of the program still appears in the Add/Remove programs of Control Panel.

I don't have access to the Windows Registry of my computer, because of security reasons, the company where I work won't allow it. So I can't get the uninstall information. I think the old app was installed using Installshield but I can't find the ODEUNST.LOG file.

Is there another way of getting the uninstall information from the computer?
And if so, how can I remove the entry using NSIS script?

Thanks !