OVERWT LNDG FOLLOWING A COCKPIT WINDOW THAT WAS NOT PROPERLY CLOSED.

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ACFT WAS BROUGHT INTO SVC FROM HANGAR. TAXI PLT CLOSED CAPT'S SLIDING WINDOW; FE CHKED WINDOW ON PREFLT; CAPT CHKED WINDOW ON BEFORE START CHKLIST. ON TKOF ROLL; UPPER AFT CORNER OF WINDOW CAME OPEN. GND SPD DICTATED CONTINUING TKOF; CLB AND LEVEL OFF TO ASSESS PROB. NOISE LEVEL PRECLUDED PROPER COM. IT WAS NOT POSSIBLE TO CLOSE THE WINDOW; THE TRIP COULD NOT BE CONTINUED; SO AN OVER WT LNDG WAS MADE (410000 LBS AND 62000 LBS OVER) SMOOTHLY TOUCHING DOWN AT 100 FT PER SECOND SINK. UPON GATE ARR; BOTH SETS OF ALIGNMENT MARKS WERE STILL ALIGNED; THE LOCK LEVER WAS STILL LOCKED; BUT NONE OF THE REAR DOGS WERE IN PLACE. ACFT WAS TAKEN OTS FOR OVERWT LNDG INSPECTION. SUBSEQUENT LOGBOOK ENTRY INDICATED PROPER WINDOW OP WITH NO MALFUNCTION. FIX CONSISTED OF OPENING AND CLOSING WINDOW. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTING FO STATES THAT THE CAPT TRIED TO CLOSE THE WINDOW WHILE AIRBORNE WITH NO SUCCESS. THE NOISE STARTED EARLY IN THE TKOF ROLL; BUT THE CREW CHOSE TO CONTINUE THE TKOF AS THEY WERE VERY HVY. THE NOISE WAS VERY LOUD; BOTH ON THE GND AND IN THE AIR; MAKING COMS IMPOSSIBLE FOR THE CAPT WHO WAS USING A C-CLAMP (COMPANY ISSUE) TYPE HEADSET.