Multiboot Usb Windows 7 And 8 And 10 Rufus
Aquilino Neadstine
Note: Use rufus and windows to create both drives, go to a cafe if you do not have access to either. Check your bios settings and rearrange the boot order so that it uses the usb to boot. (see this)
Try to install Ubuntu 16.04 next time, it should work well with most UEFI systems, but there are some systems that are set up to use some kind of legacy/hybrid implementation, which may be challenging for normal users to figure out the correct way to proceed. In your case however, I suspect that your Linux was not installed during UEFI boot to begin with. UEFI is not something you can disable after your Windows has been installed (since it expects a UEFI partitioning scheme), but you did it anyway and managed to complete the Linux installation under BIOS mode (since UEFI is off), so botching Windows (in a minor way) is not surprising.
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