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This question already has an answer here:

I want to remove the ubuntu operating system from my laptop so I formatted the ubuntu drive (previously had dual booting)

But now I run in grub rescue mode. I checked the other forums and tried the set root and set prefix with all the drives but it still shows file system not found.

Can someone help me so that I can normally boot my win 8.1 which is already loaded ?

marked as duplicate by David Foerster, Eric Carvalho, Rinzwind, terdon, MadMike Jun 11 '16 at 11:23

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You can boot up the Windows install disk and choose Repair Windows option, or you can use a live Ubuntu to do the same thing, like described here: https://help.ubuntu.com/community/RestoreUbuntu/XP/Vista/7Bootloader.
Or try this alternate method: How to restore Windows 7 MBR without a CD.

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Or you can try Boot Repair. It's a magical one click solution for boot related problems. Grab an Ubuntu live cd/usb, select the Try Ubuntu option, verify your internet connection and install the program:

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair

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