I have figured this out,

go into your world or warcraft foldder,

findd WTF FOLDER

Open Config folder with notepad

make a new line under onse of the other SET LINES
AND COPY PASTE THIS COMMAND

SET gxWindow "1"

SAVE THE DOPCUMENT AND THERE YOU GO FIXED!!!

Hi guys brand new player here,

/I used tyo play warcraft back in the day up to MOP

can we play in windowed mode?

when i switch its just A BLACK SCREEN :s

Any help greatly appreciatedd