Joomla 1.6 and 1.7 have problem to cleanup the "Admin Menu" when you have tried install an extension that failled during the installation.
In this case, event if you try uninstalling the extension to cleanup everything, Joomla may keep some records in the DB that forbid to re-install the extension later.
When this happen, you have to check the MySQL "menu" and seach for the extension.
You may found records corresponding to the extension but with an extension_id = 0.
In this case, you have to remove the entires corresponding to the extension and retry installing the extension.
Before deleting records, it is recommended to do a backup.
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