My 1995 Escort did that awhile.  The belt on the passenger side
wouldn't go more than half way.  We finally had to get a mechanic to go
in there.  He disconnected the motor.  Now you have to do the belts
manually.
     But there can be worse problems.  Someone came to look at an old
1988 Celebrity.  But she rolled one window some.  The battery was pretty
weak.  That car has power windows.  We had to put a garbage bag over the
window.

 Sincerely,
  Darren  Thornton