This is a Joomla! issue which occurs if you have updated to version 1.7 from previous Joomla! versions.
This issue does not affect clean Joomla! 1.7 installations.
This issue affects many extensions, not just Frontpage Slideshow.
One option is to install the extension in a clean Joomla! 1.7 installation. If this is not possible for any reason (e.g. your on a production website, which was built since Joomla 1.6.0) the solution to the more is to manually delete the menu entry from the database and then install the extension again.
To do so, follow these steps:
1. Backup your entire site and database. Make sure the backups are valid.
2. You will need to edit your database records directly. For that matter you will require access to some database management tool like phpMyAdmin.
3. Open your database with such a tool and find the menus table. Browse the jos_menu table (or x_menu - where x is your custom db prefix) and locate the Frontpage Slideshow entry. It's the one with "index.php?option=com_fpss" in the "link" column. You need to delete this full entry.
4. After that you should be able to re-install the extension with no issues.
If you opt for this solution make sure that you know what you are doing since a mistake can break your site. So it is very important to get a backup before you do anything.
JoomlaWorks Support Team
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