I have read in other forum posts that this is 'only' due to a Joomla 1.7 site that has been upgraded to 1.6 that is using Front Page Slideshow. Untrue! I have a fresh Joomla 1.7 install and am not using Front Page Slideshow and am not able to use K2 because of the error. I have the following extensions installed:

Akeebabackup 3.3.4Admin Tools 2.1.6Contact Enhanced 1.6.3Gantry 3.2.11JCE 2.0.14NoNumber Extension Manager with Advanced Module Manager, Articles Anywhere and Cache Cleaner installedVersions 1.851 by Fatica Consulting

 

PHP 2.6.32MySQL 5.1.52

I supposed I could start with a fresh install of 1.7 and iteratively add extensions and see when K2 won't install but I don't have any problem installing any other extensions so it certainly 'sounds' like a K2 installation issue.

have you tried installing k2 first....it would be good to know what the conflict is