It is a very strange error message that you are getting, normally there would be more information.
I would suggest reinstalling the latest myODBC 3.51 driver on the server, if that does not work install the myODBC 5.1 driver and run the install/setup wizard again to make sure the database is up to date and using the correct driver.
To have the install/setup wizard run update the files in the 'database' folder with the original files from the download from our website.
Another thing to check is that you are running the websites application pool that the forum is running in, in 32bit mode. Many drivers and other ASP components do not work in 64bit mode.