Upgrade to the full version of WoW problems

I upgrade to the full version of WoW wrath of the Lich King today online from a 10 day free trial . they said the level restriction was lifted , so the full version was supose to download by it's self while i play the game , but something happen and i had to shut down my PC ,but Later when i log back to the game i was surprise to see i was by myself no one was in it ! no guards no animals no players anyone ! .later i found a cow try to attack it but it said it was" too far away" in red, even thou i was right next to it , i'm confused do i need to download something else? i'm downloading wow wrath of the Lich king again and is takin 4 ever ...or do i simply need to wait for the 72 hours restriction ..please help