unable to validate game version

[snowicetroll]

Hi im new here, so i downloaded to pre-installed client from the website and set the realmlist but for some reason i get "unable to validate game version, this may be caused by file corruption or the interference of another program" im sure its not corrupted and theres no program thats interfering it, any help is welcome. Thanks in advance.

[Bucovsky]

Try to extract the game again and see if that helps.