if you do everything right and have a valid cd key...
game can lock and crash..
on my desktop, which is where my son plays. for a week i had a terrible time just launching the game, with crashes from launch through loading the map... I didn't do anything, but over time it now doesn't crash at all.. duno.. xp dx9 6800
on my new laptop win7 64 4750 dx10 i get crashes in a match randomly.. sometimes it is after playing for 10 min, sometimes after the 2nd or 3rd map.. deleting the shaders file, running in diff res or settings doesn't seem to help... hopn' that 2.1 might be more stable. but without any error report as to why i'm crashing on my laptop i'm just guessing atm.
it is a beta and we all will figure out the problems and get things solved.