After installing with Wubi, cant boot into ubuntu

view full story

http://askubuntu.com – I installed ubuntu (12.10) through Wubi and when i go to the dual boot screen, i chose ubuntu. But all it does is showing me a grub menu with saying " this is a minimalistic command (something something..)" and i have only the option to press tab and see some commands.. and nothing works.. please help me guys... I installed it with windows 7 (HowTos)