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I installed Ubuntu after Windows 7, Then I used to have a menu that let me choose Windows or Ubuntu.

Then for obvious reasons I need re-install windows again, then I lost my dual boot. My computer start windows without ask me nothing.

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3 Answers 3

boot from a live CD, then in a terminal run

sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update
sudo apt-get install -y boot-repair && boot-repair

this will run a graphical program that will repair your boot loader

source: https://help.ubuntu.com/community/Boot-Repair

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Boot the Ubuntu CD again and re-install grub. You can do this graphically with boot-repair

sudo add-apt-repository ppa:yannubuntu/boot-repair
sudo apt-get update
sudo apt-get install -y boot-repair
boot-repair

See https://help.ubuntu.com/community/Boot-Repair for details.

enter image description here

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If you're on Windows Vista or Windows 7, you can just use EasyBCD. It gives a really beautiful way of managing your boot menu and provides some interesting boot options that you may not easily encounter otherwise.

Alternatively, you can recover your regular grub booting with a utility such as the Super Grub Disk.

There are further options, but those two are the easiest and work just fine.

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vanjoe gave a decent approach - I've used that method and some similar approaches before with general success. Still, just use EasyBCD, it's great. –  Doc Jan 5 '12 at 21:02
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