Grub loads up when I only have ubuntu installed

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http://askubuntu.com – I've installed Ubuntu successfully after trying four times due to it hanging frequently during installation. (having the screen go wild) so I tried for the fourth time installing via removing the first three installations and reinstall ubuntu 12.10 without internet connection so it quits getting files during installation. I've finally installed ubuntu but when I booted back it loads the grub boot since I have 100 mb partitioned from my previous windows installer. It's suppose to be a system reserved partition for it's boot so I guess ubuntu sees that and made it like I'm dual booting. But I (HowTos)