When I upgraded my Windows Vista installation to Windows 7, the upgrade removed GRUB from the MBR. This is a very common issue if you are dual booting and you definitely face it some day. Reinstalling the bootloader is very common troubleshooting step if your computer refuses to boot. These days, most of the distros like Ubuntu 9.10 use GRUB 2 and the legacy GRUB bootloader is probably history now. As I've mentioned before, reinstalling GRUB is something I can do with my eyes closed because I've done it several time before. Reinstalling GRUB 2 is a bit different and is something new, its still simple though.
Since I had an Ubuntu 9.10 alternate CD, I just booted from it and selected the rescue system option. That has an option to reinstall the bootloader. This is one of the different methods to reinstall GRUB 2. Well, I could've written my own tutorial on how to reinstall GRUB2 but the Ubuntu GRUB 2 documentation has an excellent, well explained tutorial explaining the different methods to reinstall GRUB 2. So refer to it to solve all GRUB2 related problems.
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