I cannot reinstall Quicken, error says its already installed

I had some errors with quicken, forum said to uninstall and reinstall quicken. When I try to install, it says that quicken already exists and go to add/delete programs to remove and try to install again. Quicken is not installed, I cannot find it anywhere on my computer. The forum said to move all quicken files to another folder and create a new folder to install from, still won't work. Any ideas on how to re-install Quicken?