You use QcleanUI to make sure that you can reinstall Quicken correctly on your system. When you're unable to install Quicken for Windows, or if you experience issues using Quicken after a patch release, it is probably due to your Quicken not installed properly. That is when you need to reinstall it in your system. But if your Quicken QcleanUI does not work properly, you cannot perform those steps. In such case, you are to resolve the issue at the earliest. Contact our Quicken customer support experts and seek the solution to your issue. They will surely resolve it in the earliest possible time.