windshield wiper malfunction on 1998 Buick Century

driver side wiper is off track. it swings off the windshield.

Asked by for the 1998 Buick Century
The wiper spindle or linkage may be damaged but is most likely the wiper arm nut that secures it to the spindle has come loose and the wipers need to be placed in the normally parked position at the bottom of the windscreen, the wiper arm repositioned on the driver's side and the tighten the nut perhaps using Loctite to prevent the nut working loose again.