PIPER PA28 PLT FORGOT TO OBTAIN LNDG CLRNC AND LANDED ON A CLOSED RWY DUE TO DISTR BY OWNER PLT IN R SEAT.

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DEPARTED DPA (WEST CHICAGO) VFR DIRECT RFD INTENDING TO PRACTICE ILS RWY 7 APCH; WHICH WAS SUCCESSFULLY COMPLETED. AFTER THE MISS; I RECEIVED VECTORS TO JVL. I INTENDED TO FLY A COUPLED ILS. I WAS CLRED FOR THE APCH ILS RWY 4; WHICH I THEN INTERCEPTED AND FLEW INBOUND. I WAS ALSO INSTRUCTED TO CONTACT JVL TWR (I ALREADY HAD ATIS INFO). AT THIS JUNCTION ERRORS OCCURRED. THE OWNER/COMMERCIAL PLT IN THE R SEAT; WHO ALSO COPIED ATIS; REACHED ACROSS THE YOKE CHANGING THE AUTOPLT SETTING; AT WHICH TIME THE PLANE BEGAN A L TURN AWAY FROM THE LOC. HE WAS FRUSTRATED AT THE INABILITY OF THE AUTOPLT TO PROPERLY FLY THE APCH. I WAS THEN DISTR AND AGITATED AT HIS INSISTENCE TO HAVE ME MANUALLY HAND FLY THE ILS. WE THEN PROCEEDED TO LAND ON RWY 4 WHICH; ACCORDING TO ATIS; WAS CLOSED DUE TO PAINTING AND STRIPING THE RWY. (NO ONE WAS ON THE RWY AND NO EQUIP WAS NEAR THE RWY AREA.) ADDITIONALLY; SINCE WE FAILED TO SWITCH TO TWR; I HAD NOT RECEIVED CLRNC TO LAND; WHICH WOULD NOT HAVE BEEN GIVEN ON RWY 4. NOTE: I RECOGNIZE A SEVERE PROB WITH COORD OF RESPONSIBILITIES WITHIN THE COCKPIT BTWN THE OWNER/PLT AND MYSELF.