Linux Ubuntu Xubuntu GNU Grub boot startup problems when using Wubi HD

I had been using Xubuntu 9.10 successfully for some time. Recently, however, I tried to boot Xubuntu, and instead of reaching the login screen, the events documented in the video above occurred. Before this started occurring, my computer would turn on and then display a menu to choose the OS. If I selected Xubuntu, a few lines would flash by, and the login screen would appear. My computer is a Dell XPS M1530 laptop. The operating systems installed are Windows Vista Ultimate and Xubuntu 9.10. The Xubuntu was installed using a Wubi installation. If everything works normally, how would I boot Wubi Xubuntu from the GRUB interface? If this is a problem, can it be fixed? Thank you for any assistance.