If you don't like the bootloader settings chosen by DrakX, you can change them here.

For instance if you have several Linux installs on your system and don't want to squeeze all of their bootloaders into the MBR (Master Boot Record), you can choose to put the bootloader at the beginning of your new / partition and chainload into it from the bootloader of another Linux install

If you have very limited disk space, it may be helpful if you click on Advanced and check the box for Clean /tmp at each boot. This may help you maintain some free space.