I have been using Firebird (1.5) with a delphi 7 application for
years. I am using Interbase Express (IBX 6.5).
I recently moved to a VISTA machine. I have never installed Firebird
on this machine, so I went ahead and installed Firebird 2.0. I took a
backup file from my old machine and installed it with GBAK on my vista
machine.
I use Database Workbench (2.8.5) and it can access the database fine,
everything looks good there.
When I access the database from my program, it errors on connect:

unsupported on-disk structure for file C:\WhenDB\Whendb.fdb;
found 32779.10, support 0.0

The only GDS32.dll (in windows\system32) is dated 3/2/2007 2:05pm.
When I look at Database Properties in DB Workbench, it says
Version: WI-V6.3.1.12855 Firebird 2.0
I have tried uninstalling and reinstalling Firebird a few times
(using Run as Administrator).
Any advice would be appreciated. Thanks.

--Pete