Wow error 3

If you cant play wow like u install it and when u wanna go in it tell that your wow is bugged and you need to fix error 3.you need to do Next things :
Go to your wow directory :
D:\Program Files\World of Warcraft
Or
C:\Program Files\World of Warcraft

Find Wow.exe
Change name (any other name)
then lunch wow without launcher ( i mean if u changed Wow.exe name into Dota.exe just lunch dota.exe)
and u will go in WOW and then exit and repair it and it should work