I really can't see any good reason to spend that money to put windows in laptops for poor children. It would be much wiser to use linux and buy more laptops.
Even now, RedHat Linux is used in local government offices. Wondering what happened now, for switching to Windows 7 for freebie laptops. Huge drain on the exchequer.
Also, I can't see any good reason at all to put Windows on any PC, but that's another story ;).