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Here's another way to select all the windows that takes even less time:

a) Make a series of nearly parallel selections of each column of windows.  Include in each column the non-window space in each column.  I would suggest doing this using the polygonal lasso tool. Save this selection.  Call it, "columns" or something similar.  This is a total of 5 selections.

b) Do the same for each row of windows.   This is a total of 15 nearly horizontal rectangular selections.  Call these selections, "rows" or something similar. 

c) With the "rows" selection still loaded, go to select / "load selection", and change the mode to the last option which is the Boolean intersection of the two sets.  Select the "columns" as the new selection to be intersected with the existing "rows" selection.

d) You now have a selection that consists only of the windows, ie, each place where a row selection intersects a column selection.

The total number of selections you have made is only 20, ie, 5 + 15.  Compare this to making 75 (= 5 x 15) tiny selections or painting that number of little rectangles.

HTH,

Tom M