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I am beginning to think that it is impossible to install Windows 7 Ultimate 64-bit on a system pre-installed with Windows 8. I have done several of the steps that the process requires yet I still am halted at the installation menu by a message that states Windows 7 cannot be installed on the partition because it is GPT format. I went into the BIOS and disabled the UETI secure boot. I put it in Legacy and reboot in that mode. System recognizes the DVD and setup begins installation but the fact the the partition I set up is in GPT format, I can't doing anything else. It's not compatible with the version of Windows that I am trying to install. I know that Windows 7 uses a different format, but I don't know how to resolve my issue. I do not want to uninstall Windows 8 from the system because it was pre-installed when I bought the machine. I even went so far to look for the product code of the version that was already loaded on my computer, but it doesn't give me the full code, just xxxxxxxx- and the rest of the code. I don't feel secure uninstalling Windows 8 and reinstalling after doing Windows 7, so my question is: What can I do to get Windows 7 installed on my Windows 8 machine. I have successfully installed Windows 7 via VMware, but I'd prefer to have it on my physical system; some programs do not run well with virtual machines. Please help me.