During configuration of the OCS 2007 Software Update Service you need to run the ConfigUpdatesServer.vbs script. However running the script might result in the error "ERROR: OCS Common Files not found in registry".
If you are using a 64-bit version of Windows 2003 the error can be caused by running the command with the 64-bit version of cscript. The 64-bit version of cscript accesses the 64-bit area of the registry (high level picture 🙂 and since OCS 2007 is not a native 64-bit application it stores its registry information in the 32-bit area of the registry. To overcome the problem use the 32-bit version of cscript found in c:\windows\syswow64.