#1 uninstaller - Version 2.0 #1 Uninstaller is a solution designed for all Windows operating systems (Windows XP/2000/NT/Me/98/95) that offers an easier and better way to uninstall programs you no longer want on your computer. #1 Uninstaller helps you maintain a cleaner computer and a cleaner registry. The product is also intelligent enough to indicate the programs that have been already removed from your computer.