From your description, I am not sure what might cause this problem.
Have you checked the web page on Formativ Frequently Asked Questions?
If you are still unable to install, could you post more information about your system? Please include details of your hardware, the installed versions of Windows, the NetWare client and GroupWise.
Was GroupWise running while you tried to install Formativ? You should close all applications before installing.
To ensure your system does not have a corrupted installation of Formativ, please remove it before attempting another installation. Run Add or Remove Programs in the Windows Control Panel, then click the button Change/Remove on Advansys Formativ Admin/Developer.