Hi, I got the same problem. Here’s what I did to fix it. Close ID. Open the registry editor by typing “regedit” in the “run” dialog box and hit OK (To open the “run” dialog box hit Start > Run). Go to HKEY_LOCAL_MACHINE > SOFTWARE > Adobe > InDesign > 4.0. Delete the two keys “Feature Set Locale Setting” and “User Interface Locale Setting”. Start ID. Things should be back to normal.
Renaming the folder as mentioned earlier did not work for me.
Regards
Sven