Tim, Thanks for the response. I'm able to read the
registry, but the problem (as you described) is the
organization of the registry. Where do I look in the
registry to find the Excel Product Id Key for all Excel
installations?

I have MS Office 2003 installed. To obtain the Excel key,
I use:

"Software\Microsoft\Office\11.0\Registration" &
Application.ProductCode

and the "ProductId". This gives me the Excel Product Id
Key displayed by Excel Help.

I doubt this will work if the user has a different
version of MS Office installed or only Excel. Your
example illustrates this. I need the general method to
find the Excel key.

Does anybody know how to find the Excel Product Id key in
the registry for all (most?) Excel installations? I need
the key displayed by Excel Help.

Also, Please submit any suggestions you have for better
machine specific key(s).

thanks.