Problems instaling linux

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http://www.linuxquestions.org – Hi first at all English isn't my native language so sorry if I suck. I try to install linux mint 64 bits in my pc but i have the problem that the picture make flashes and after a while if freeze with horizontal lines and i have to reboot, this happen a few times so i try to install ubudu but whit this is worse because don't even let my see the desk because its freeze with again he horizontal lines. I don't know what to do (HowTos)