Error installing VB6 application.

Hi to everyone,
I am new in this forum, and I have a problem I can't resolve.

I have a VB6 application that uses ADO to open an Access Database; the connection string is
"Provider=Microsoft.Jet.OLEDB.4.0;Data Source=C:\Normstahl\Preventivi Rivenditori\Database\DB_Main_Riv.mdb;User ID=;Password="

I run the application in a virtual machine (Windows XP) where VB6 IDE is installed, and everything goes right; I install the application in a "naked" Windows XP virtual machine, but when the app tries to open the Database the following error is raised:

"Run-time error ' 2147467259 (80004005)' :
[Microsoft][Driver Manager ODBC] Data source name not found and not default driver specified."

Any idea would be appreciated.

Thanks