first I preface by say I have have pc since the 80s . this be the first keyboard I ever use that will not work correctly . it refuse to be recogize by my win 7 64bit one-year old system even after a full bio update . to operate the keyboard I have to manually unplug it and then plug it back in . Tech support want I to change bio setting ... something I have never do for ANY keyboard . what be up with that ?? the Logitech board be also pepper with problem story about this product . needless to say , this one go on the shelf -lrb- have it too long to return it -rrb- and the trusty Microsoft keyboard come out of retirement .