d3dx9_39.dll is missing and IT WONT MOVE TO SYSTEM32

d3dx9_39.dll is missing apparently, and i made a promise i wouldnt go afk, so i didnt, i downloaded d3dx9_39.dll, listened to ALL the instructions, yet e very time i tried to copy and paste the dam thing it would give me this dam error saying it wouldnt copy,the game is almost over and my friend says they r losing now imma be in the lower Queue thingie or watever becuz of this new leaverbuster. ALL the other times my computer crashed or sumthing, i fix it, now there is a new prob. somebody post a fix plz

"lower queue," thats wat it's called