Can't open game?

Hello! This is my first time playing and I can't seem to get the game to open up. I am using it as instructed on the downloads page and going through wow.exe but I keep getting this message;

"Data/enGB/wow-update-enGB-18273.MPQ: World of Warcraft can’t make a required change to an archive file. Be sure you have write permission for the World of Warcraft folder or try running the game in administrator mode. For more information, see: https://battle.net/support/article/6910"

I am running it in administrator mode, and I have set my security program to bypass the folder which WoW is located in, and it still gives me this message. I'm not sure what I'm doing wrong.

If it means anything; I am using a windows 8 system and trying to load the Mists of Pandaria version of the game.

You have to change the entire WoW folder to be able to read and write.

Right click on your WoW folder and check OFF "Read-Only". Press Save.

See that if that helps.