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I am desperately trying to get Windows to boot again. Here's what happened.

I installed Ubuntu 16.04 a while ago using a USB flash drive onto my hard drive. It never booted when I tried to boot up, it would always go to Windows 8.1 (my normal operating system). Today I was messing with things and decided to make the Ubuntu partition bootable using Ubuntu. It somehow hid the partition from the Disks application. I didn't really think about it until I tried to boot Windows 8.1 back up. Every time I boot it up, it says "BootDevice not found". I went back into Ubuntu using my USB and made it unbootable. But, even after that, it still says "BootDevice not found" when trying to boot with my hard drive.

I am desperate and I'm afraid I messed up my entire computer. If someone could get me an answer quickly I would be extremely grateful. Thank you so much.

EDIT: Also, I don't have any CD/DVD slot in my laptop.

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This happened to me once. What I did was I booted from the USB that I had used to install Ubuntu. From there, I installed another version of Ubuntu onto the hard drive and then used the grub from this version of Ubuntu to access my other OS (I was using Elementary OS).

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    Oh my goodness! It works. Thanks a million! I truly thought that I had completely destroyed my computer. May 12, 2018 at 23:31

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