Ok found the reason. After reinstalling the game without any modifications it was sill not working.
I found the problem by chance caus when trying to start the game with the enCN folder renamed in enUS folder it crashed the game, and then I saw in the error log that when loading there was a suspect file named 52233kou.dll in my "C:\Documents and Settings\"name of user".PRIVATE-4SFIB93.000\Local Settings" folder that was loaded as well. right after deleting it the game is running again.
I don't know if this is a sort of virus or keylogger, nor how it ended on my system. It's perhaps related with the skeleton.exe file so if I see anything strange I'll keep you informed.
Gonna change my account password just in case
When you log on a realm type "/join english
" to get in touch with the community members.
WoW English/Chinese glossary
(2000+ translated words) found on wow-in-chinese.jfs-web.chEnglish speakers are consolidating on the same realm for Cataclysm check this thread