Thanks for the additional background.
You should be able to resolve the problem using the following approach below.
1) Uninstall Formativ 2.5.
2) If not completely removed by the uninstall process, delete the Formativ program folder (C:Program Files (x86)AdvansysFormativ).
3) Remove any user related data in:
4) Install Formativ 2.0.1.
The above steps should prevent any necessity to fiddle around with the registry.
I hope this helps.
[This message was edited by Support 2 on September 21, 2011 at 09:40 PM.]