[ubuntu] Windows 7 Wont boot

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http://ubuntuforums.org – So, im completely new to ubuntu and I just wanted to try it out. So i set up a dual boot with windows 7 and ubuntu, and ubuntu works fine. Yet, when i try to boot windows 7, it gives me the error "unknown filesystem" with grub rescue under that. I don't know what to do..please help. If it helps i did install ubuntu before, but it had a grub problem so i did a reinstall, and thats basically where i am now. Again, please help and thanks for any input. (Hardware)