Runtime Error 91

Hi

I have a VB6 Application wich connect to an Access 97 database. We have a
function to connect to the database like this

Dim wrkDefault As Workspace

Set wrkDefault = DBEngine.Workspaces(0)
Set objDatabase = wrkDefault.OpenDatabase(strConnectionString)

In the references we are using the

It works on all the computer, but today we found a problem with one
computer. On this computer we have Microsoft Office 2003 with Access 2003
and Windows XP Home Edition. And each time we try to run the program we get
the following error :

Runtime Error 91 Object variable or width block not set

and after that

Runtime error 429 : ActiveX cannot create object

Normally when we have this kind of problem we ask our customer to update
their MDAC and jet version. But this time, it didn't work. The setup told
me that the version of mdac is already updated.

I checked the version with the MDAC Component Checker, and the version is
MDAC 2.8 SP1.

I tried to remove Access, make all the windows update. But nothing works.

Can some help me ?

Thanks