I'm thinking this may be an OT as it relates to a problem I'm having trying to get multisites working on my postnuke site, but since the error is related to a problem with the mysql db I figured I'd ask just to see what comes of it. So apologizes in advance if this ticks someone off.
I get the following error after copying my multisite config.php file to my postnuke install directory:

ADONewConnection: Unable to load database driver
Fatal error: Call to member function on a non-object in /wwwroot/htdocs/webdev/nubiint/includes/pnAPI.php on line 486

Appearantly this is a common problem in PN in that no one has been able to resolve it. I've confirmed that I'm using the correct password to connect to databases, so I'm thinking I can rule that out.
Would anyone here have any ideas on what else I can check to try to resolve this particular issue? My mysql skills are alsobasic so if there's a way to check for connectivity please let me know.

TIA