Problems Opening Game

Anyone else have issues with trying to open the game? I run the game in Administrator's mode, but i get an error message saying that an archive file can't be change and to try running in Admin mode. Here's the actual message:

Data/enGB/wow-update-enGB-17898.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.


Can anyone help?
I was able to open the game yestercay, but today I can't.

follow these steps:
1) Restart your PC
2) close your Torrent client and move your WoW folder away from your Torrent's download destination
3) now right click on WoW folder> Properties> remove "read-only".