[xubuntu] Cannot use Xubuntu

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http://ubuntuforums.org – Hello, i buy a new Computer and i want to use Xubuntu. I downloaded Xubuntu 12.04 64 Bit Desktop. If i try to boot from Live CD my Screen wents with bright colors and reboot what can i do? Currently i have windows 7 64 bit installed wich works without problems. (Hardware)