Mists of Pandaria doesn't start?

I downloaded and installed Mists of Pandaria on my pc (system Windows 10) but when I click on WoW.exe, the game doesn't start even if in the task manager shows it is running. Trying to launch it by administrator, using Windows XP setting and other stuff, it gave me this error:

" 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 "

Already did both things, what can I do to resolve? :/