Here a few informations to install "Avery Zweckform DesignPro V5.5" in silent mode for Win7.

1. Unpacking the "DE_de_DP5_DL_20100525.exe" with 7-zip
2. Starting the setup.exe with the parameter -r to get a setup.iss in the windows folder.
3. Copy the setup.iss in your unpacked folder where the setup.exe is located.
4. Start the setup.exe with the parameter -s

Uninstalling:
C:\PROGRA~2\COMMON~1\INSTAL~1\Driver\9\INTEL3~1\IDriver.exe /M{F82C6574-AD88-4B40-A432-970BC77F1BD2} /S
or better you copy all the files where the IDriver.exe is located to you folder where the unpacked setup files are and you have all togehter and start it from there.

Good luck!