Invalid Path Error

Setup:
Dell server running Small Business Server 2003, IIS 6.
Have a registered domain name mycompay.com .
Inside and outside computers can successfully reach the webpage.

Problem.
Building a website that uses ASP to pull from an access db. (I know, switch to SQL Server. That will happen soon, but for now I'm stuck.) When using a DSNless connection to the db, which is on another partition referenced as R:, I get an error that tells me R:\dbfolder\dbname.mdb is an invalid path. I know that's not correct. Anyone have any idea why this happens and how I can fix it?

Sorry if this is not an IIS question, this was the best place I could think of to start.

Thanks in advance.

You're right, this really isn't an IIS question.

A likely reason is that the IIS user account has no access permissions to the mdb file. Assuming, of course, that other code that uses mdb files work properly.