To make it even clearer: Someone "gave you" (illegally!!!) a pre-release build of Mac OS X 10.4. You shouldn't have access to it at all. You're illegally trying to use this development build as your operating system. The *ONLY* help we can give you here, and this can't be stressed enough, is that you should destroy any copies you have of the illegally acquired OS build and buy the retail version of Mac OS X 10.4.x. You could also use the Panther (10.3.x) discs which originally came with your computer and use the older OS instead and update to 10.5 when that comes out in Spring 2007. Because both the Tiger update and the 10.5 update will each cost you 129 USD, and Panther still works quite well indeed.