I've been trying to solve this for a while, even had a topic here: I can't boot after Ubuntu installation
Long story short, I installed Ubuntu alongside Windows 7, replacing Windows Vista. Now, when I turn on my computer, I get to grub with two options: Ubuntu and Windows 7.
Ubuntu works well, but after I choose Windows 7, I get redirected to the Windows GRUB-like environment, where I can choose either Windows Vista or Ubuntu. Neither of them works.
Anybody knows what am I ought to do now? Maybe making the GRUB option Windows 7 turning on the Windows 7 straight away?