Ty máš disk větší než cca 2 TB, nebo proč tam máš takový partition table? Asi budeš muset změnit na MBR.

Nebo:
http://windows7forums.com/windows-7-installation-u pgrade/5552-if-windows-7-supports-gpt-why-cant-i-i nstall-os-gpt-3.html

But to use a GPT drive to boot into Windows 7, you must use Windows 7 x64 and have a UEFI enabled bios and install as UEFI. This only refers to the boot drive and not another drive installed in the system.