I Can't install UBUNTU on my new PC

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http://askubuntu.com – I have a Advent 9111 PC with Radion ATI HD 6670 2 gig graphic card (it appears there is no on board graphics on M'board) I can't install any of the latest versions of UBUNTU. When I try to install the screen after a few seconds goes pixelated with lines running all over it, then if I leave it running the monitor cuts off with no signal going to it. I've tried 64 bit installation and also 32 bit. I CAN run all versions in 'Virtual Box' but want to dual boot with Windows 7 I'm presuming that the drivers for my graphic card arn't in the initial drivers when installing. Help please. Bobkat (HowTos)