hey guys well today i had the same problem and i was searching how to solve this issue well i read some other problems that ppl had and evry1 had another solution,
some one said to update ur comp date, some one said to reinstall the game well what i did it and nothing work, well befor i start to play i install windows live mail and i choose work on offline mode
after couple of hours looking what to do i just put it back to Online mode and now its working
if u changed IE or Mozila or msn (or anything ) to work OFFLINE just put back it on ONLINE mode..
it worked fine for me so gl