Did you run over anything in the road or something seemingly unrelated? The same thing happened to one of my rear windows, switch wouldn't work even though all other windows worked. Turned out I had run over something that severed the wire. On my 97 Contour the wires run along the driver side. The sever was right underneath the trunk release lever. It's pretty hard to see unless you have the car up on a rack though.
Good luck with yours.
