Ignition switch

When the car turns over, the ABS light comes on and my wipers, Windows and air conditioner. Wont work. I used to be able to turn back the key a little towards accessories position and the ABS light would go out and everything worked. Now I cannot turn the key back before the engine quits. Without the engine running, in accessories, everything works fine. Can I simply replace the ignition switch to fix the problem? All the fuses and relays seem to be fine. The car runs with the ABS light on, just the previous power accessories do not while the light is on.