If all password are forgotten / lost - there is a way of recovering....
But you will require a floppy disk with a password reset program - this will wipe ALL passwords on the system - it can only be run from the actual PC being used as the program boots prior to windows.
Any computer shop should be able to fix it - by computer shop I don't mean PC World, Dixons etc - they'll probably tell you it can't be done without wiping the whole system!!
Jam
December 2004