User Account Control (UAC) is a security feature in Windows. It allows you to determine whether or not you want to be notified if changes that require administrator permission are made to your system.
During the installation of Switch, you are asked to disable UAC. If you don't, you will not be able to install Switch, nor will you be able to work with it. You must leave UAC disabled, also after you have finished the installation.
To disable UAC