Rhys (DayZ)

Hey guys, just bought ARMA II and got DayZ. Everything has been running smooth, it all installed easily etc. but now when I join a server I get to the loading screen that just says 'Loading' with a single loading bar and it freezes. The bar reaches 100% and after that nothing happens. I have waited 15-30minutes multiple times, on multiple servers and no luck. How do I get past the loading screen freezing :(