[AccessD] using a visual studio created dll on a windows 7 machine and access 2010

Folks,

I have a dll I created in Visual Studio 3.5. that provides the capability to
create very structured xml files from access data. It worked great on my
development machine with access 2003 and visual studio 2008 installed on it.
Now I have moved to a windows 7 machine. I moved the access 2003 mdb file to
the Windows 7 machine. Moved my .dll and it's associated .tlb file to the
Windows/system32 directory. Then ran the regasm version in the
Windows\microsoft.net\framework64\v2.0.50727 directory. This is supposed to
be the version of regasm.exe for framework 3.5 files. Regasm says it
registered the dll and it is in the registry. The problem is I reference it
from access using the vba tool/references menu. Can't even find it from the
browse button on the tools/references when I look in Windows\system32. 

Anyone have any suggestions on this? I don't know if this is a
permission/security issue or what. I need to figure this out as I need to be
able to run this on various machines at a customer's office after I get it
running here. There we have a mix of Vista and Windows 7 machines.

I appreciate any guidance.

Doug