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”. Many PCs still ship with text-mode UEFI settings interfaces that look and work like an old BIOS setup screen.I recently destroyed my Windows 7 UEFI boot sector by overwriting the corresponding EFI partition. It also means that UEFI setup screens can be slicker than BIOS settings screens, including graphics and mouse cursor support. UEFI can run in 32-bit or 64-bit mode and has more addressable address space than BIOS, which means your boot process is faster. It also boots in a more standardized way, launching EFI executables rather than running code from a drive’s master boot record. That’s because UEFI uses the GPT partitioning scheme instead of MBR. That’s roughly three times the estimated size of all the data on the Internet. The UEFI firmware can boot from drives of 2.2 TB or larger-in fact, the theoretical limit is 9.4 zettabytes. This new standard avoids the limitations of the BIOS. RELATED: What's the Difference Between GPT and MBR When Partitioning a Drive? You need to buy new hardware that supports and includes UEFI, as most new computers do. Most UEFI implementations provide BIOS emulation so you can choose to install and boot old operating systems that expect a BIOS instead of UEFI, so they’re backwards compatible. UEFI replaces the traditional BIOS on PCs. There’s no way to switch from BIOS to UEFI on an existing PC. How UEFI Replaces and Improves on the BIOS
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