Can't install Ubuntu 11.10 on laptop

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http://askubuntu.com – So I put ubuntu 11.10 32 bit on a CD, booted from it and what it does is go on a screen with a logo and stickman at the bottom. Then the screen goes black with the blinking white cursor as if there is no OS on it. The laptop is a toshiba satellite, the processor is an AMD phenom II p290 Quad-Core and if it helps I have Windows 7 installed already. (HowTos)