I don't quit recall the GUI for v2.5 but once you have windows up and running go to the top left of your screen (Apple at top left) and you should see the Word Parallels to the right of the Apple. Look across and Virtual Machine menu, highlight, scroll down to "install parallel tools." In v2.5 I can't remeber if you need disk. Just have your windows and parallels disks ready just incase they are asked for. Also have your internet connect running.