Hi Ead.. Well you are setting UEFI mode as Enabled.. So after this setting, if you try installing any OS like Win 7 x64 or x86 , motherboard no longer recognizes the Windows 7 installation DVD.
Its not sensing because motherboard didn't sense any EFI file system in that media.. if you want to confirm this scenario then try installing Win 8 (it contains EFI file in it), this will work .
So if you want to install Win 7 OS in UEFI mode then enable "Legacy mode " also. make sure Secure Boot should set as disabled.
I think these setting should work... if not try only legacy option (Disabled UEFI option)