If you got tired of your Windows, here's a way to deal with it. You could clear out everything on your Windows. This includes the system itself and any other files on your Windows. *Before doing this, backup everything that is important on your Windows if you still want them!!!* *Also, unplug all your external harddrive, eject all CDs or DVDs and unplug all your USBs* To uninstall, first go to your application, then to a folder named utilities. Open utilities and run Disk Utility Choose the harddrive on the left that you installed Windows on. It would be most likely named "disk0s3" After you selected the harddrive, click on the tab that says "erase" Then click "security options" Choose any of the options except for "Don't Erase Data", read the description below the options and choose the one you like. After that click "ok" Then click "erase" A message would pop out, click "erase" It will start clearing out everything on your Windows When it's done, you have uninstalled your Windows!! But, it's not finished yet, you still have to partition your drive back to one. Select the top most harddrive on the left. You would see that there's another tab availiable now. Select the tab that says "Partition" On the screen, it will show 2 boxes. One would say Macbook HD, the other would be "disk0s3" Click on the box with "disk0s3" and click on the sign with " - " on. It would be at the bottom of the 2 boxes. A window would pop out asking if you want to remove it, click remove. When the removing is done, you'll be left with only one box that says MacbookHD on. On that box's right bottom corner, you'll see some lines on that corner. Click, hold and drag the corner down to the very bottom. Then click apply. When it's done, you're done!! You've cleaned Windows from your Mac and back with only one harddrive partition!!!!!