All of the machines I need information from seem to be in Lansweeper. I need to look at these machines, get the OS Type (i.e. Windows Server 2003 Enterprise x64), and/or the version of SQL Server (i.e. SQL Server 2000 or 2005), and the correct product key to go with it.
As you can see here - I get the listing of OS broken down :

However, on a machine-by-machine basis, I only get the bland Microsoft Windows 2000 in the section I get the product key. As you can imagine, when doing my reports, this won't be accurate enough.

Lastly - I was wondering if you had confirmation on key location for SQL 2005 (9.0)
I think it is HKLM\SOFTWARE\MICROSOFT\MICROSOFT SQL SERVER\90\PRODUCTID
It doesn't appear to be picking it up yet, although maybe I need to wait longer.