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I have been trying to install Windows 7 all day with no success. At first, it said that the current system policy is blocking the DVD. I figured out that it was the Secure Boot and I disabled it.

Now the DVD boots but it hangs on the first loading screen which says Starting Windows and the animated Windows logo. I believe that it's something to do with the UEFI because it boots using Legacy Mode normally, but it won't install Windows 7 while Legacy Mode is on due to the presence of GPT disks which require UEFI to be enabled during the installation.

I would also like to add that my Windows 8 DVD only boots wihle Legacy Mode is enabled and it shows "No bootable devices found" if I select UEFI.

Please do not recommend me to erase the disk as I have important files on the disk and not willing to do this. Any help will be greatly appreciated.

Thanks.

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Unless you are trying to boot from a GPT disk you don't need UEFI. With 7, you can read GPT disks in legacy BIOS mode, just not boot from them. If they are non-boot drives, perhaps just detach them during install, and reattach them after Windows up and and running? –  Ƭᴇcʜιᴇ007 Mar 17 '13 at 18:00

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