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I've got an Asrock Z68 Extreme 3 Gen 3 with an Intel 2600k. It got the UEFI BIOS. I got 4 HDDs and I run them as AHCI setup.

Now, I want to install Windows 7 64Bit over my Windows 7 32Bit. I boot up from the DVD, all goes well until the menu where I have to choose the HDD I want to install Windows 7 64Bit on.

I choose C:, like always, and it tells me

Windows cannot be installed to this disk. The selected Disk has an MBR partition table. On EFI systems, Windows can only be installed to GPT disks.

What do I do now? I'm currently in Windows 7 32bit writing this, and this is how my partitions look like from Windows 7 partition manager:

enter image description here

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You need to convert from MBR to GPT. Technet has an article with all of the details.

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Awesome! Thanks! – Don Salva Oct 26 '11 at 16:11
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