THIS IS AN OUTDATED TUTORIAL AND IT COULD GIVE YOU SOME PROBLEMS WITH XP, BUT IF YOU USE WINDOWS VISTA 32 bit AND 64 bit HERE IS THE RIGHT ONE FOR YOU JUST CLICK HERE ! At least you can use some tools to make it look like a Mac OS, here you can get them : Make sure you install Flyakite, and the RK Launcher, i also included a Leopard icon Pack that you will like, there is also (not exactly part of leopard)a Flip 3D window program that gives you the liberty to choose between Flip 3D windows or the Spaces feature that shows your windows separated etc. For the Iphoto effect you can use Picasa 2 , for the icalendar use Mono calendar, and to make your winamp look like an Iphone just look for the skin at http://www.winamp.com/ or at google, and for a complete Mac OS X Theme you may use the Windowblinds program , look for it on Google, its a trial version so you need to buy it, i got mine in a torrent tracker, so look for it on Google. Edit: i just uploaded another tool to make your windows ...