Welcome to PlaneShift.
If you had searched the forum, especially the area about issues before entering the game, you should have found several threads already, explaining that the launcher needs to change files in the UAC protected "Program files" branch, if you installed it there, and therefore you have to select the option "Run as Administrator" in its context menu (right-click on its icon). That would not be necessary if you had installed it elsewhere, where the Windows UAC does not protect your installed applications from unintended changes.