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I have a single-boot Ubuntu 14.04 installed on my system. Gparted shows the disk partitions like this:

enter image description here At the moment, I want to do a clean install of Windows 8.1 so that I can dual-boot later (with Ubuntu 14.04). I created a bootable usb using Rufus, selecting the "GPT partition scheme for UEFI" and NTFS options. To check, whether my machine was in UEFI mode, I used this command:

~$ df -h --local | grep /boot
/dev/sda2       237M  108M  117M  49% /boot
/dev/sda1       511M  3.4M  508M   1% /boot/efi

Seeing the above, I am assuming my machine supports UEFI. Also, in the BIOS settings, SecureBoot seems to be off, and Legacy Support Enabled:

enter image description here

The issue I am facing is that when I try to boot, I get the error:

[FAIL] Could not locate '\efi\boot\bootx64.efi': [14] not found

Here's a snapshot: enter image description here

Could anyone please help with identifying the reason why this error is occurring? If I disable "Legacy Support", would it resolve this? I read up on the differences between UEFI and BIOS, and the function of Legacy Support, but I am kinda new to dual-booting so don't want to mess up. Would be glad of any help. Thanks!

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    Rufus is a WIndows program. How did you use it in Ubuntu? – TheWanderer Jul 4 '16 at 18:08
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    Along with my mates said, you need to make sure that you burned a Windows 8.1 x64 ISO, and not x32 ISO, because the message indicates that the system couldn't find a bootx64.efi, which comes only with Windows x64 ISO. – iSR5 Jul 4 '16 at 18:18
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    @QPTR ah, that explains it. But the Windows 10 ISO isn't greater than 4GB, is it? – TheWanderer Jul 4 '16 at 18:29
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    @Zacharee1 I think the version appearing in 2017-18 or so may be above 4GB, given the current growth rate. – Paul Stelian Jul 4 '16 at 18:34
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    @PaulStelian Doubt it. – Ramhound Jul 4 '16 at 18:39

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