Unable to find Siebel Oracle90 - Installing Siebel Client Mobile

When I try to configure System Dsn  ,Siebel Oracle90, I have the problem that its not exist, and give me an error. The client give me an error with user and password.
The main problem is that i installed several times, the mobile client, in different path.
I have to configure regedit, in odbc.ini and ODBCINST.INI, and change all path to the new path. Indeed, i have to copy the parameters in a pc thats have all the values of registry in odbc, because it erased all.
now its works!
Other option that i didn't try, You can install the client again in the same directory as the first time.