Help for a friend of mine with installing Windows 7

[Valsako]

Friend of mine recently got a computer that he intended to put Windows 7 on, the OS originally on it was DOS: OS. He went into the BIOS, and tried changing the boot priority to the CD:ROM, which for him appears to be UEFI.

When set to this, he gets this: "EFI DVD/CDROM <HL-DT-ST DVDRAM GUA0N> has been blocked by the current security policy".

Help?

For reference:

 

[gregrocker]

It says that the BIOS is set to Legacy instead of EFI, with Legacy media meant to be booted first. So the device to be set first to boot is the DVD-RAM shown under Legacy.

But this is not necessary because you should be able to boot the disk using the one-time BIOS Boot Menu key shown on first screen. Choose the Legacy DVD drive and not the EFI one.

If you'd prefer to install to UEFI BIOS then change the top two settings to UEFI mode and UEFI First, then boot the UEFI DVD.

Either way you will need to delete all partitions during the booted install using the Drive Options shown in Steps 7/8 of http://www.sevenforums.com/tutorials/1649-clean-install-windows-7-a.html