It could be few things here. If you have any, use 10-15 pF instead. If your setup is on a breadboard, you may try to remove those capacitor around your crystal and see what happen.

All wires, leads in the crystal/cap section have to be as short as possible. If you have any picture of your current setup, just post them here.

Few other things,
  1. LVP fuse must be set to OFF
  2. 0.1uF Capacitor + 10-47uF capacitor have to be installed as close as possible of your PIC Vdd & Vss rails
  3. make sure there's no loose connection
  4. make sure the Vdd rail is neat.
HTH