A B757 CREW REJECTS TKOF WHEN COCKPIT WINDOW IS NOT CLOSED.

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DEPARTING DTW ARPT IN A B757 ACT; ALL CHKLIST ITEMS WERE ACCOMPLISHED NORMALLY BEFORE TKOF. ON TKOF ROLL AFTER THE EPR WAS ENGAGED AND THROTTLE HOLD WAS ANNUNCIATED AT 80 KIAS; I NOTICED LOUDER THAN NORMAL WIND NOISE ON THE CAPT'S SIDE WINDOW. THE WINDOW WAS FOUND OVERCTRED IN THE TRACK; BUT THE LEVER LOCK WAS IN THE UNLOCK POS. AN ABORT WAS INITIATED BY THE FO (PF) BTWN 80-100 KIAS. I TOOK CTL OF THE ACFT; APPLYING FULL REVERSE THRUST AND ROLLING THE ACFT TO THE NEXT TXWY; APPLYING MINIMAL BRAKES TO EXIT THE ACTIVE RWY UNEVENTFULLY. THE ROLLER PART OF THE WINDOW WAS OVERCTR JUST BARELY OFF THE STOP AND THE WINDOW LEVER LOCK WAS IN THE UNLOCK POS. AFTER VERIFYING THE ROLLER FULL FORWARD AND LEVER LOCK IN THE LOC POS; THE FLT ATTENDANTS WERE BRIEFED ABOUT THE ABORT BUT WE WERE UNABLE TO COMMUNICATE WITH THE PAX BECAUSE THE PA WAS INOP. WE REFED THE BRAKE CHART; REACCOMPLISHED CHKLISTS; AND TAXIED TO THE ACTIVE RWY AGAIN WITH FUEL AND EVERYTHING BEING OK. AN UNEVENTFUL TKOF WAS MADE AND WE PROCEEDED ON TO THE DEST. SOME OF MY OBSERVATIONS FROM A HUMAN FACTORS POINT OF VIEW: 1) ON OUR BEFORE START CHK; AN 'OVERCTR AND LOCKED' REPLY TO SIDE WINDOWS ON THE CHKLIST -- I USUALLY CONFIRM THE FO'S SIDE WINDOW LEVER LOCK IN 'LOCKED POS' BEFORE I CHK MINE. WHEN I CHK MINE; I LOOK TO SEE THE ROLLERS OVERCTRED; BUT YOU CANNOT SEE ALL THE WAY TO THE STOP. NORMALLY; I PHYSICALLY CHK THE LEVER IN THE LOCKED POS. THIS TIME I PROBABLY GLANCED AT THE LEVER LOCK AFTER LOOKING AT THE ROLLERS OVERCTRED. THERE ARE NO LIGHTS IN THE FLT DECK TO INDICATE AN UNLOCKED LEVER. THERE ARE NO EICAS MESSAGES TO INDICATE THIS EITHER. 2) WITH AN INOP PA; IT MADE FOR DIFFICULT COMS TO THE PAX. THE ONLY INFO THEY GOT WAS FROM FLT ATTENDANTS WHO KNEW THAT SOMETHING WAS NOT RIGHT AND THE FLT WAS ABORTED TO CHK IT OUT. THIS REALLY STRESSES THE NEED FOR OPERATIVE PA'S AND NOT A 3 CALENDAR DAY FIX ON THEM. 3) THERE MIGHT BE A BETTER WAY TO ENSURE THE LEVER LOCKING MECHANISM IS RECOGNIZED IN THE LOCKED POS USING A SIMPLE LIGHT OR EVEN RED MARK IN THE UNLOCKED POS ON THE B757. ALSO; A CASUAL GLANCE CAN'T CONFIRM THE ROLLERS IN THE FULL FORWARD POS.