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At first I formatted the hard disk which contained my Ubuntu 11.10... After that my machine showed a black screen with grub error.

I then installed Ubuntu 13.04 on the hard disk again. Now it gives me the option to boot from both Windows 7 and Ubuntu. Ubuntu is working correctly but when ever i chose to boot from Windows it tells me A DISK READ ERROR OCCURED...

What could possibly be the problem?

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When you boot from Ubuntu you will be able to see your windows partition in Nautilus (File Manager), does it have files there? Can you see the partition? –  Meer Borg May 11 '13 at 20:02
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