[wubi] Wubi GRUB overwritten by Win7. Really need help!!!

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http://ubuntuforums.org – Hello and thanks for reading, I really need help now, as I have a project for work stuck on an inaccessible Wubi Ubuntu install. I currently have (had) Wubi installed alongside Windows 7 on my laptop. I was finished using Ubuntu so I restarted back into Windows and went to do something while it restarted. I came back and Windows was doing a start up disk check! Previously when I started my laptop, I received a screen asking if I wanted to boot into Windows or Ubuntu. I still get this screen, but now if I choose Ubuntu I am simply given a GRUB prompt, and it no longer boots into Ubuntu. I (Hardware)