Back in Windows Vista, Microsoft added a new security feature called 'User Account Control' (UAC) which blocks potentially dangerous actions that can be executed automatically by malware. UAC dims the whole screen and shows a confirmation dialog. It limits the access rights of the user account even if your account is an Administrator. To install and uninstall most programs, you need need to elevate. Sometimes, you may get this message when uninstalling programs: "You do not have sufficient access to uninstall. Please contact your system administrator". Let us see how to fix this.