Hmm i know theres a dell tool bar but why anyone would want that is behond me, so i presume you mean this? http://www.delldock.com/
like a shortcut app that sits up there.
It may still be on your system, if you download it again and install ita prob say something or you can just reinstall it. But if it dosnt apear when you boot up it may be removed from thestart up, and just needs readding.
.. that is if delldock was what you was after lol.