Installation problem

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http://askubuntu.com – Whenever i install Ubuntu 11.10 (64 bit) in Windows 7 (64 bit & i know my Dell Studio 1555 is an 64 bit computer) using wubi.exe after completion of installation i restart the computer to allow Ubuntu to complete the further installation but after restarting i get the following message. "GNU GRUB version 1.99-12ubuntu5 Minimal BASH-like line editing is supported. For the first word, TAB lists possible command completions. Anywhere else TAB lists possible device or file completions. grub>" And Ubuntu is unable to complete the installation. Help me because i need Ubunt (HowTos)