I also use the Brinkster professional account and everything is working
Only change the question marks(?) for your own site path this is my actual code ...
'---- Set the path and name of the database -----
strDbPathAndName = "c:\sites\Single??\username\database\??????.mdb"
'-------------------------------------------------
you can also check if it points to the right type of database also in the common.asp files
'Database Type
strDatabaseType = "Access"
'strDatabaseType = "SQLServer"
If it doesn't work I would delete the forum and re-upload it. Maybe you have a corrupted file.