WOTLK Patching Error

Whenever i start the patcher, it gives me this error:
" The installer does not need to be applied. It requires a version of "WoW.exe" older than 5.0.0.0, but you already have version 6.2.4.21742."
Whenever I start the client the game tells me it is downloading an update, and it stays at 0%. Then, an error message pops up and says " Patch Required, press the restart button below to exit world of warcraft and download the patch." after i click the restart button, it takes me back to the login screen of the client and a message pops up and says "Failed to apply patch. please try again later. if this problem persists you may need to reinstall or contact technical support.

Please Help

you need to log-in by using your warmane account name, not email addres.
Be sure your client is still 3.3.5 otherwise you need to download it again