[ubuntu] Windows 7 doesn't start after ubuntu installation

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http://ubuntuforums.org – Hi all, I am in big trouble since I tried to replace my XP installation by ubuntu: I have a single hdd with a primary and two logical partitions. Primary was xp, first logical is windows 7, second data, both ntfs. Since I installed ubuntu, windows 7 is shown under media/win7 but unbootable. Tried to handle that with boot-repair. It shows win7 under "further options" - > "mark this as boot" ... "sda5: win" When I try to repair by Windows 7 install CD, it is not shown in the list of exisiting operating systems. What happens? already tried "grub-upda (Hardware)