Be careful. If you use Ubuntu based systems (like Ultimate Gamers Edition), the last installed OS is responsible for the bootloader. If you installed UGE after Ubuntu deleting will render the system unbootable. To be safe, boot to your Ubuntu and type this in a terminal:
sudo grub-install /dev/sda
Now remove the partition UGE-partition and after that launch this command:
Now your system should be in a bootable state.
Keep in mind, when you are messing with your partitions, make a backup first, just in case you don't have the recommended regular backup.