Weird problem can't rly understand

Hi i have a problem since the release of Wotlk which is i can’t do any quest like for expemple i can see that lich king give me a quest but when i click on him nothing happens i taught that it was only with the quest thing turned out that i can’t even talk to the pnj’s of the game like flymaster repair master or something like that i have no addons installed no Weak aura’s no nothing i deleted the game several times but the problem is not solved Ps : deleted the chara or started a lvl 1 with another classe same thing) need help plz

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