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I have gone through many pains to boot through my windows 7 partition.

I had windows 7, then one fine day I installed Ubuntu and again formatted the partition where Ubuntu was installed only to find the my Windows does not boot(Probably corrupted MBR).

I again installed Ubuntu later but the Grub could not detect windows.

So I manually added windows by editing the file 40_custom. But when I select the win7 entry in the grub, it displays the error : no such disk. What do I do??

Additional Info : Ubuntu version : 11.10 x64|| Win 7 Home premium, 64 bit|| While in the process of debugging I once also came across the error : Sector 32 being in use by FlexNet.|| Strongly in need of booting my Win 7 without any formats or fresh OS installations.

Thankful for any Diagnostics and Solutions to my problem.

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Edit your question to show the output of sudo fdisk -lu, and what partition you pointed grub to in 40_custom. –  psusi Jan 24 '12 at 1:57
    
/dev/sda1 63 208844 104391 de Dell Utility |||||| /dev/sda2 208896 30928895 15360000 7 HPFS/NTFS/exFAT |||||| /dev/sda3 * 30928896 432075772 200573438+ 7 HPFS/NTFS/exFAT |||||| /dev/sda4 432076798 976771071 272347137 f W95 Ext'd (LBA) |||||| /dev/sda5 432076800 439936174 3929687+ 82 Linux swap / Solaris |||||| /dev/sda6 510949376 976771071 232910848 7 HPFS/NTFS/exFAT –  Chandra Sekhar Jan 24 '12 at 14:08
    
As I said, please edit your question and add that info so it is readable instead of putting it in a comment. –  psusi Jan 24 '12 at 16:04
    
Please run Boot-Repair's Recommended repair, and indicate the URL that will appear. This will help us understand your situation. –  Yann May 25 '12 at 3:30
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3 Answers

I've fixed grub errors using Super Grub Disk.

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Did you try update-grub?

I hope you have installed both times grub to the same place. Mbr or partition, because there could be two grubs and only one is active (I do).

Start a terminal with Strng+Alt+T and type sudo update-grub, press Enter, then your admin password is needed, it will not be shown, don´t worry, Enter again and with luck the grub finds Windows, two ones the loader and recovery.

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no it did not work.. –  Chandra Sekhar Jan 24 '12 at 0:44
    
Then use a recovery-CD of win7. It will repair the MBR and install a win boot-loader, which finds ubuntu. If this is not working, perhaps the ntfs partition of win is damaged. –  Marek Jan 24 '12 at 1:18
    
The windows boot loader does not find Ubuntu. –  psusi Jan 24 '12 at 1:56
    
sorry, of course. I meant boot-manager, in win this happens automatically –  Marek Jan 24 '12 at 2:53
    
the problem is even the windows cd can't find my windows partiton, but let me tell you the files are intact and i can access them using a Ubuntu live CD. I also tried fixboot fixmbr but even they could not give any results... it's also strange that when i try to install a fresh windows 7 install there pops up a new error : please place a DVD/CD which contains the drivers, looks like the win 7 cd needs some drivers of my pc. –  Chandra Sekhar Jan 24 '12 at 12:54
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Yes, this "super grub disk" worked on my system also. You must look at the start careful to get the right entry, x32 or x64 machine!, it´s not easy to read because of the colour. The problem is grub itself on competition with win. I have now 12 entries, 4kubuntu,6ubuntu,2win+2memory, boring. With lilo or win boot-manager there was nothing like this.

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