Your very welcome . Well the only drawback in windowed mode is that while the game is paused you can`t move the cursor to the edge of the screen and look around but other than that gameplay is normal. but if you have a program that overlays the the card specs on screen while you play just so you can keep an eye on card temps and clocks would be good too
Just thought of something at your convenience look in CCC most probably in the global settings and make sure there is nothing set to forced and if there is just set to auto or application controlled