Need help with Ubuntu installation

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http://askubuntu.com – I have a Toshiba Satellite-L655 laptop with Windows 7, and I want to install 12.04 LTS. The problem is that I have a problem with Windows. The problem is that, when I turn on my laptop, it gives this options: "start up repair (recommended) and "Start Up Normally". If I choose Start Up Normally it goes to Start Up Repair anyway. When Start Up Repair runs, it says "startup repair is checking your system for problems". This goes for like 7 minutes, then it says that it couldn't fix the problem, so I can't use Windows. I was wondering if I was able to install Ubuntu in somehow. If possible, (HowTos)