You need some patch for WoW, you can find EVERY patch here [url=http://www.webspace-kostenlos.com/wowzer/patches/wowpatches.htm]WoW Patch[/url]
Edit by Kiel 7.14.2006
This thread, was unupdated a bit. So i added list with working patches:
[url]http://www.wowwiki.com/Patch_mirrors[/url]