Original Title: Can't uninstall or reinstall

I have a desktop PC running Windows 7 (64).  I have lost all reference to Live essentials.  It is not shown in "all programs" or in "programs & Features,  so I am unable to uninstall it.  However when I try to download Essentials it states that all the programs are already installed. I need help to uninstall or repair Essentials.  Has anyone any ideas?