I too have found this thread 

http://social.technet.microsoft.com/Forums/sharepoint/en-US/41e1874f-7825-4bfe-ba4c-37255d198df2/script-error-when-opening-document-menu

There are some things that are not clear here, it says run the office diag tool from SPD -- are they running this on the server as it is unlikely that the end users have SPD. If running from server then this does not make much sense.

Either way am going to run the tool on the target machine and if that fails then re-install office.