Just happened to me...but AdBlock doesn't seem to work with Vista...at least not for me.
This really needs to get fixed...we've been having these problems for months now...
LEFT4DEAD411.COM
Bet with disolitude: Left4Dead will have a higher Metacritic rating than Project Origin, 3 months after the second game's release. (hasn't been 3 months but it looks like I won :-p )