Grinding noise when trying to shift into reverse,and wont shift into reverse..? on 1997 Volkswagen Jetta

I just bought a 97 jetta i was notified that the reverse hasnt worked for three years, it makes a grinding noise and either stalls or goes into first gear. Also im trying to repair the windows myself does anyone have any idea what would cause all four windows to not work? including the sunroof its stuck 3/4 the way open tried to manually close it but even that doesnt work, the bolt spins but the sunroof just refuses to close the rest of the way..please help

Asked by for the 1997 Volkswagen Jetta