I've done everything mentioned short of reinstalling, and seems as my download rate is barely 200kb/s I just thought I should try and see if there's anything new I can try. I'm running windows 8 and Mcafee antivirus and yes I've tried everything with my antivirus turned off.
Can you please delete this folder and try again? :-
No joy... atleast not for me
Try some of the stuff there.This error doesn't have a straight forward answer.Different things work for different people,so who knows.
Can you please try removing the Updates folder found in your World of Warcraft directory, then launch the game again?
If that doesn't work, also in the World of Warcraft folder, can you remove the wow.mfil file, then run the game again?
Please let us know what happens.
I eventually got round it by uninstalling my Mcafee Anti-virus, rebooting and then the launcher worked and downloaded the required patch.
Even though Mcafee was turned off, even after a selective startup, it was still finding a way to work in the background and block the launcher update so uninstalling it was the only option left to me (which worked).
This may not work for you Clarence but if all else fails then it may be worth a try :)