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grub shows that there is Windows, but when I click on it, it showing me a black screen with a dash at top-left; and then sending me back to grub what can I do? please help !!!

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I doubt if you are able to "click" on the GRUB Boot screen. Have you already tried 'update-grub'?

However, to fix Windows boot, insert a Windows bootable repair/recovery media and attempt to fix the MBR. There should be a utility to scan your active Windows installation and then rewrite MBR. For example, Windows 7 and 8 has a bootrec utility.

Once it is done and you are able to load Windows, then you will need to attempt to repair grub which should pick up your valid Windows entry from MBR.

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