Disable ease of access on screen keyboard

Hi;

I activated the ease of access on screen keyboard a while back because Vista
did not recognize my ps2 keyboard after I installed the driver. I finally got
it to work , special buttons and all, but now I cqn't seem to turn
off/disable the on screen keyboard. It pops up every time I start my
computer, and all I am able to do is close it temporarily, until the next
start-up.
Please advise
Phil