i have same issue with a toshiba satellite l455D-s5976 notebook. it came preloaded with win 7 home premium.
i worked on this laptop last month (for a friend) and it was heavily infected with malware and a couple trojans. i cleaned it and used it for a couple days before returning it.
i dont have restore disks but am tempted to reload windows - has to be a driver issue.
i did plug in a usb keyboard, but it did not work either.
i may but from a linux distro on a cd, or from barte pe to verify.