Hi,
I have had exactly the same problem.
After a lot of problems I have had to un-install the game. Last week I called EA and spoke to someone in Texas he sent me a link to the latest patch. This didn't work so I called EA because their UK office is local to me here in Surrey. I got through to a tech help guy (Jody). I asked him if there was a patch. He sent me instructions to uninstall. Which I have done. Now I have started to re-install it has worked up to a point but I get a message saying there is a DLL file missing from Ambitions and it wont load. I have already loaded the base game, WA and Fast Lane.
I haven't tried to start the game up yet. So I think I will try and give them another call this afternoon and see if they and help me. I had to be a bit devious as they obviously don't like people phoning their offices and would rather we made calls through the premium rate 0870 number.
edit.. Btw I was told that this patch has been removed so has it beencausing many people problems- I would think so