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Xcopy /s C:\Windows\Boot\EFI\*.* B:\EFI\Microsoft\Boot Select vol 3 #Use the number corresponding to your windows installation List partition #Make sure that the 100mb partition is selected Type into the terminal (but leave the #… parts out – they are only comments by me): Now we will create the two missing partitions: the EFI boot sector and the Windows Boot sector.When Windows starts from the DVD, select the desired language and then press Shift+F10 to open the terminal.Select the former and then don’t forget to press any key if you are asked to – otherwise, the non-UEFI part would be booted. One with “UEFI:” in front and one without. Make sure you boot the UEFI part of the disk: When you open your boot menu by pressing F8, you will see two entries for your Windows 7 disk. In the end, you should have at least 229 MB of free space on your hard drive – preferably at the beginning.

Delete what is remaining of the Windows boot partition (not the Windows partition but the partition of around 128 MB size) and the EFI partition – you can use GParted for this.

This is how I fixed it (please be careful when dealing with partitioning and boot sectors, backup your data beforehand): This resulted in an error “Reboot and select proper boot device or insert boot media in selected”. I recently destroyed my Windows 7 UEFI boot sector by overwriting the corresponding EFI partition.