Please try upgrading Joomla! to the current release -- 1.6.3 I think. There was a problem with Menu Items in one of the releases.
Bob
I found this on this thread in the Joomla! forums:
I had the same problem with one of my extensions on a clean 1.6.0 site. Installing the extension always gave the error, "Error building Admin Menus". Uninstalling gave the error, "Could not delete the administrator menus.". No amount of uninstalling and reinstalling fixes the problem. The only solution was to manually delete the menu entries from jos_menu:
delete FROM `jos_menu` where title like "COM_MYEXTENSION%"
After that, everything worked fine.
Sorry, I can't identify what caused the problem in the first place. If it happens again and I figure it out I will post here.
Bob
