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This question already has an answer here:

I have a really big problem. I deleted Ubuntu partitions from Windows 8 and now on startup of my other pc (im using my old one now to contact you) it shows this error:

Unknown filesystem: grub rescue>

tried some commands from other threads but it shows me again the same error. I think that Ubuntu has been completely uninstalled, but this grub rescue pops me out.

I cannot boot in my pc anywhere! either in Windows. The only thing i can do is write commands in grub rescue, or enter BIOS Windows Menu... :(

marked as duplicate by Takkat, falconer, Avinash Raj, karel, mikewhatever Jan 31 '14 at 2:54

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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This is the correct procedure. It's for Windows 7 but works for 8 too. From How to remove Ubuntu and put Windows back on?

To remove Ubuntu, you will need a Windows Recovery CD or Installation CD, or a Ubuntu Live CD.

Note: If you don't have a Windows Installation or Recovery CD available, you can download the Windows 7 ISO file (contact Digital River costumer support as said in Microsoft help page). You cannot install Windows with a genuine Purchased Product Key though, as these ISO files are 100% legal and will only install as an Evaluation copy for 30 days without a product key.

To remove GRUB:

  1. Grab a Windows recovery media or installation CD and boot from it. You should see this on a recovery media CD.

    enter image description here

    And you should see this on an installation media CD. Click "Repair your computer" and you should see a screen like the first image. Image from bleepingcomputer.com

  2. Open the Command Prompt, then type bootrec /fixmbr into the Command Prompt.

    enter image description here

  3. Reboot and boot into Windows. Then follow the steps below to remove the Ubuntu partitions.

    (Images from HowtoGeek)


If you don't have a Windows recovery CD or you are too lazy to download and burn the ISO files mentioned before, you can use Boot-repair. It is a tool that fixes most boot problems(Windows or Ubuntu). I suggest using a Windows CD if possible.

To use boot repair:

  1. Boot from a Ubuntu live CD or USB

  2. Type these lines in the terminal one line at a time.

    sudo add-apt-repository ppa:yannubuntu/boot-repair
    sudo apt-get update
    sudo apt-get install boot-repair
    
  3. Search for Boot-Repair in the Dash and launch it.

    enter image description here

    To fix your computer with Boot-repair, simply click the "Recommended Repair" button. Then follow the steps below to remove the Ubuntu Partitions.


To delete the Ubuntu Partitions:

  1. Go to Start, right click Computer, then select Manage. Then select Disk Management from the sidebar.

    enter image description here

  2. Right-click your Ubuntu partitions and select "Delete". Check before you delete!

  3. Then, right-click the partition that is on the Left of the free space. Select "Extend Volume". Go through the Wizard and Finish it. enter image description here

  4. Done!

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