Couldn't find installable isam

On most of the computers I have no problem to install and run my VB6-program. But some win2000's give the error "Couldn't find installable ISAM".
Can anybody tell me which dll's I have to check on these computers or which dll's I have to send with my setup???

I didn't find a clear solution on the net :-\

Sounds if the corrects database drivers are missing.
Install MDAC_TYP.EXE on these machines.

The only thing that helped was replacing the VB6FR.DLL with a newer version 6.00.8988

Thanks for helping anyway ;)