Since Wubi is a Windows Directory, if I read it right, then I'd try a Puppy
Linux Live CD and Mount the Windows Directory. Then copy your personal files off
to USB or to another directory in Windows temporarily. Afterward, you can copy
them back, if you want using Puppy or Ubuntu's file manager. Remember to
un-mount in Puppy and Ubuntu, the latter may need the Password to proceed, just
like most things, like downloads and updates.