Flickering screen and off-set screen after second boot in Wubi

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http://askubuntu.com – I had this problem before with Fedora and solved it by deleting random lines in the GRUB2 launch commands. This time I decided to use the Wubi install of Ubuntu. First boot was fine, but the second caused a massive amount of flickering and the screen was offset so high up I can only see about 5px of the bottom. I tried pressing "CTRL ALT F2", but with the offset I have no idea what I'm typing. I'm fairly certain 'sudo dpkg-reconfigure xserver.xorg' or 'nomodeset' are the way to go. But how? Graphics card is Radeon 6000HD Series. (HowTos)