To be honest, I have limited 777 experience....
In January of 2003 I was on an AA 777 from JFK-LHR and I remember being seated in 32A. I declined the exit row because I remember not thinking there was a window, nor seeing one on boarding.
I sat further back on the return flight but see a window IIRC....
In August of 2003 I was on an El Al 777 and got the exit row, but there was no window, so I switched seats.
Then in January of 2004 I was on an AA 777, but I was in J and did not see if there was a windo in the exit row....