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I just installed Ubuntu 12.04 through Windows Installer, Every thing was fine but after rebooting, I can see the list of Operating systems in the Boot menu, but when I go to Ubuntu and press Enter, I'm getting the message as Try (hd0,0):FAT32:error:"prefix" is not set. Please help me....

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Its all about the grub loader. The default boot priority set in grub is stored inn /boot/grub/grub.cfg(grub2) else in /boot/grub/menu/lst(previous versions). You have to manually set the boot device correctly, mentioning the correct root partition which holds your grub loader files. Do it as: you change the groot from (hd0,2) to (hd1.0)?

Would sudo grub
grub> root (hd1,0)
grub> setup (hd1)
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