MoP client issue, help pls.

Just downloaded the MoP client, this is the message I receive upon opening WoW.exe:

Data/enGB/wow-update-enGB18273.MPQ:World of Warcraft can't make a required change to an archive file.Be sure you have write permission for the WoW folder or try running the game in administrator mode.

Tried running it in admin mode. Same result.

Thanks in advance.

Change the folder's properties to not be "Read-Only."

I actually re-downloaded, this time MoP Minimal, everything's fine now. Thanks for the input anyway. :)