Windows 7 Windows Essentials Problem

Having some problems trying to get Essentials 2012 to work i try to install photo gallery but when i try to start i get the dll error and saying reinstall but cant because it says its already installed. Essestials does not show up in the program list so i have to use revo uninstaller hunter mode to get rid of it, and when i reinstall get the same again. Can anyone help out please