How to solve "Unknown command 'keystatus'" when booting ubuntu 10.04?

Hello, I've installed Ubuntu 10.04 using Wubi. When booting for the first time, everything worked fine. However when I try to boot now I get this error and booting freezes.

Error: Unknown command "keystatus".

If that helps, I'm using HP ProBook 4510s and Windows 7.

From ubuntu Keiji

• I don't have a specific answer, but if you're able to boot into Windows I would start with a check that all is well with the Windows partition by running chkdsk /r as described on the WubiGuide wiki. You might also want to take a look at the section on repairing using a LiveCD in the same location.

  If you're also not able to boot into Windows, you'll probably have to boot from a Windows CD into the recovery environment and repair the MBR.

  From moberley

• keystatus is a GRUB2 command which needs the grub module of the same name to be loaded to work. I assume if the command is unknown that module can't be loaded anymore for some reason...

  Did you install any updates between the first & second boot?

  From JanC