madmekelly,
That machine has been exposed to some serious moisture. Flood it with sewing machine oil. Take off the face plate, the inspection cover on the back, the stitch length lever cover, and flood it everywhere with oil. Let it soak, repeat till it's free. The needle bar and presser foot shaft might need some heat as well so hunt up a hair drier.
Take your time. It will need a thorough cleaning before you're done, so don't worry about getting too much oil on/in it.
Joe