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I was using two operating systems at my computer. Window 7 in partition (C:) and Ubuntu in partition (D:). I didn't need Ubuntu any more so I formated partition (D:) from Windows 7. Then I restarted the computer and it started showing this error:

Error: unknown filesystem.
Grub rescue >
Zanna
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user1738871
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1 Answers1

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Try using "Boot-Repair-Disk" https://sourceforge.net/p/boot-repair-cd/home/Home/ Your boot information is still in your windows grub file, "Boot-Repair-Disk will fix your grub problem. Just follow instructions on the site above and you will be fine>

Christine Frederick
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