The default location for the WolfQuest Setup installer is in /My Documents/My Games/, and that works best on most Windows computers. But occasionally it triggers this error. Please try running the 'WolfQuest Setup' again and this time, install the game in /Program Files/. It may work just fine then, or you may need to right-click on the WolfQuest game icon in Program Files/WolfQuest, and then choose 'Run as Administrator' the first time you run the game from there. Subsequently, that should not be necessary.
If this doesn't solve the problem, please follow the instructions on this page.