I always used Linux (Ubuntu) in a dual boot configuration with Windows (using Grub). Having Windows on your computer is always handy.
I bought a MacBook Pro 8.1 last week. OS X is amazing. I followed a video tutorial on how to setup a triple boot (OS X, Linux, Windows). Everything worked great after installing Windows next to OS X; for this I installed rEFIt and did some partitioning. When my MacBook Pro arrived, the partition scheme was GUID (also called GPT) *and I installed Windows 7 successfully.
Unfortunately I then screwed it up and needed to reinstall everything. I started with OS X, which works fine right now. During the installation of OS X I already partitioned my HDD in three partitions:
100 GB: OSX
060 GB: Windows
160 GB: Stuff
Before I could install OS X, the setup said I had to use GUID (it was by default something else), which is the same partitioning scheme as in the beginning.
When I try to install Windows 7 for the second time (after I screwed it up), it says that I can't use a GPT Partitioning Scheme.
Why not? Why did it work the first time? Is there a way to solve this problem without having to format my HDD? If not, how do I have to prepare my HDD to make it work?