Scenario is: You've decided to install Mac OS X on your PC and to move on from Windows forever. That being said, you made only HFS+ (Mac OS X Journaled (Extended)) partitions using Disk Utility and your partition table is GUID.
After some time, you realized that you'll need Windows, from some reason. But, problem is, you can't install Windows on pure GPT. Whatever you do, your windows installation is giving you an error that Windows can't be installed on GPT partition scheme.
Luckily, there is an easy way to make this possible. Thanks to Rod Smith, we have a command line utility called GPT fdisk:
GPT fdisk Tutorial
A gdisk Walkthrough
Enough talk, lets go to business.
In short, we'll need to make one hybrid mbr partition using gdisk.
First go and download disk for Mac OS X (available for linux and windows also):
Obtaining GPT fdisk
You'll need to partition some partition or to resize existing one with Disk Utility to FAT.
Then, fire up Terminal, and type
where X is number of your HDD.
In my case that's number 3. You can see, that it says
MBR : Protective
That means that you use pure GPT layout. Our goal is to transform it to hybrid in order to start windows installation. So let't do it.
Type p (to print the partition table)
Type r (for recovery & transformation menu)
Type h (for Hybrid transformation)
From there just follow the instructions.
In my case, partition number is also 3, so I type 3 for my partition to be added to the hybrid MBR.
I also choose to make that partition bootlable, so I type y on "Set the bootable flag".
Type p to print the partition table
Type o to print protective MBR data.
And finally type w to write table to disk and exit.
And that's it. To check you can type again gdisk command:
And as you can see, now it's
Hopefully, now you will be able to run windows installation without any error.