QUOTE
There is no concept uninstall in boot loaders, because if you uninstall a boot loader, an unbootable machine would simply remain. So all you need to do is overwrite another boot loader you like to your disk, that is, install the boot loader without uninstalling GRUB.
For example, if you want to install the boot loader for Windows, just run FDISK /MBR on Windows. If you want to install LILO (I can't imagine why you want to do such a thing, though), run /sbin/lilo on GNU/Linux.
I grabbed that from
here.
I also found a lot of useful info
here.
You really should back up your important data. There is a possibility that you can make a disk unbootable or mess up your partition table. Use caution, things could get hairy. Just make sure you have access to another working computer in case you need to go online for help.
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