Can't start Windows after installing ubuntu

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http://askubuntu.com – First I've installed Windows 7 and then Linux Mint on another hard-drive. So when I started the PC I saw the Grub-Menu with the possibilities to start Mint or Win7. Then I wanted to install Ubuntu too. So I installed Ubuntu on the same hard-drive as Windows. And here is the problem: The Grub-Menu was the same. I could choose between Windows and Mint. But when I took Windows, there was a secound Grub-Menu, where I could choose between Ubuntu and Windows. And when I took Windows again, I got the error message error: no such partition I thought that it would help and deleted ubuntu (with gp (HowTos)