Madcatz

you should be able to order recovery discs from the laptops manufacturer and use those to recovery the unit. but most likely that will delete all of the user data. but as long as the partition is still intact, you could hook the drive up to another computer and backup the data.

it is sometimes possible to replace the file, but you would need a windows xp install disc, and only somethign I would recommed an experienced person to do.