Help Please

So I'm just now trying to get into private WoW servers and I've chosen this one because well... It looks great. But everytime i try to join it just pops up with this:

"Data/enGB/wow-update-enGB-17266.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"

What do I do to fix this? Any suggestions?

I have the same issue and I used to play on the wotlk server. I am at a loss of solution...

http://forum.warmane.com/showthread....319716&page=12

there is a post with a short video by a guy with a name that starts with a s like skullbashat.
fixed it for me

Check the permissions on your game files. If the "Read only" box is ticked, un-tick it.
Make sure every file in your MoP folder, sub- folder etc...

This fixed it for me.