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I want to install Windows7 on my system with pre-installed Ubuntu 11.10 to play some games in my relax time.

But after installing Windows7 over Ubuntu my computer doesn't show OS chooser (GRUB) in the beginning of system startup.

Now I've lost my Ubuntu installation disk but I still have its .iso file. I can't, or don't want, to burn it to a CD/DVD?

Is there any way that I can use that .iso image to repair system startup without need to burn that CD again?

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Please correct your title. You want to repair boot for using both operating that are installed. – Kaktarua Jul 14 '12 at 21:16
Can I run grub from within windows 7, may be a better title. – richard Jul 14 '12 at 21:49
Windows will wipe out grub once you install it on a machine, that is why it is recommended to install Windows first then Ubuntu. But there is of course a fix for this, you can try boot-repair or simply install grub again but to do this, you need to install the Ubuntu ISO to a USB drive if you don't want to burn it to a CD. – Peachy Jul 15 '12 at 14:13
up vote 2 down vote accepted

Its easy to install duel OS but If you install windows after Ubuntu Grub will be affected. Grub is a booting system of Linux base system. You can follow above steps or you can do just the following....

To fix booting problem you can install a program 'EasyBCD' in Windows. Download it here

Follow these steps to restore GRUB when after installing EasyBCD:

- Launch the program and select ADD NEW ENTRY from the EasyBCD Toolbox

- Select the 'Linux/BSD' from the operating systems column

- Choose GRUB (Legacy) under type and Click on the ADD ENTRY icon

- Choose YES to the restart prompt

GRUB will be displayed after the restart which will detect the Ubuntu partition for you to be able to boot into Ubuntu

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I think, he said, he has already Windows installed. Thanks for the EasyBCD part – Anwar Shah Jul 16 '12 at 18:53
Thanx for this great solution Kaktarua. – Manik Rastogi Jul 23 '12 at 7:40

You could only try to get the .iso image onto a USB Stick. For this, you can use every operating system. (For more information about this click here, look below to see the steps for copying Ubuntu onto a USB stick)

The USB stick is like a normal CD, but it is much faster.

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All you need is a USB stick with 1 GB or more and another PC. – slashcrack Jul 14 '12 at 21:15

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