Error on installing Alcatel Lucent 20A

I am trying to install DSL with my modem Alcatel Lucent 20A, but I am receiving error: DSL modem already installed.
To upgrade the software you must remove the current software and run the setup again.
I already removed the Alcatel Lucent folder in the Program Files folder but it has no effect.
Please help me resolve my problem.
Thank you.
