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I first installed Windows 7 ultimate onto my machine and using Windows 7 built-in partitioning system, I had partitioned my disk into many smaller disks of NTFS file systems. I then tried to install Ubuntu 12.04 onto my machine.

I had installed Ubuntu and Windows 7 side by side because I needed both the operating system but while booting I was getting an error as

Attention out of range
H:92.6KHz  V:58.2Hz

I was not getting any dual boot menu no msg was seen except the above message. I tried to press the down arrow thinking that it might take me to the option. First time it directly logged into Ubuntu then next time Windows 7.

When I logged into Windows 7, I deleted the volume in which Ubuntu was installed. Now, I am getting the error as

error:unknown file system 
grub rescue>

I want Windows 7 back and a better way to install both operating systems. Please give me some help in this regards.

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Take a look at this: help.ubuntu.com/community/WindowsDualBoot – Mitch Jul 25 '12 at 19:07

1 Answer

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If you have a Windows CD you boot your PC from it and you go to Repair. There you will see the option to open the CMD.

In cmd you type this 2 codes:

bootrec.exe /FixBoot
bootrec.exe /FixMbr

And you will get your Windows boot back. After that just try reinstalling Ubuntu as usual and it should work.

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after trying this two commands i got an error as A disk read error occured to (some unidentified ascii characters) – A palekar Jul 26 '12 at 16:07

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