d3dx9_39.dll is missing

i had to refresh my computer because it shit itself yesterday, removing all my applications but keeping my personal files. it didnt require me to reinstall league, and i can go through the client with no issues, but when it goes into the game, i get an error message saying i'm missing a dll file. i tried repairing league, it didnt work. is there any way to fix this besides just completely reinstalling league? (installing this game takes an eternity -.-)