If you want to get your apple bootloader back you can try this- Run Disk Utility and click on your internal hard disk (the disk itself, not the partition under it). Then click on the Partition tab. If you move the triangular slider that adjusts the partition up and then back to where it was, the 'Apply' button becomes active (it starts greyed out). You can now click 'Apply,' and the partition will be left alone, but the bootloader will be recreated. The full help is available here on this page, please read it before proceeding! Alternatively, you could just fix the GRUB error by booting from your Ubuntu Live DVD and using the tool to correctly install GRUB.

This is Windows 7 being installed on a MacBook Air from a USB thumbdrive. Note: it's not a requirement that the thumbdrive is pink. So you've gotten yourself the sleek new MacBook Air and your first thought is to install Windows 7 on it. Firefox for mac snow leopard free download. OK, that's my first.