Cannot dual-boot Ubuntu and Windows 7

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http://askubuntu.com – I am trying to install Ubuntu 12.04 on my grandfathers personal computer. He currently has a Toshiba Satellite with Windows 7 Home Premium pre-installed on it. There is a partitioning error because of the partitions NTFS uses. The error I am experiencing is the lack of the following option: "Install Ubuntu alongside Windows 7" Tried using GParted to rearrange the partitions but that didn't work. Please help me. (HowTos)