Quests issues

Hello,i just downloaded new WOTLK client(i mean the whole game) and im not able to take any quests or speak to any of NPC-s.Anyone having the same issue,or is anyone able to help me to resolve this?

Thanks in advance!

PS.Already tried relogging,restarting the game etc. but didnt work.

Try deleting the WTF folder , i played last night and it worked fine.