Rainbow six vegas for pc crashes?

i installed rainbow six vegas for the PC an been playing it for a few days every once in a while it just closes no errors or anything an i have to restart it.. anyways i wanted to try multiplayer.. it worked fine i was having fun then it just closed again without warning or error i start it back up click... show more i installed rainbow six vegas for the PC an been playing it for a few days every once in a while it just closes no errors or anything an i have to restart it.. anyways i wanted to try multiplayer.. it worked fine i was having fun then it just closed again without warning or error i start it back up click multiplayer click "online" then it says retreiving info and after a second or two it closes no errors or anything just closes now EVERY single time i click online it does that i cant access the multiplayer part of the game how do i fix this whats causing it? i have a AMD 64 4000+ 2.40GHz 1GB PC3200 and a 7600GT 256MB PCI-E graphics card maxtor 300GB HDD 7200rpm 16mb cache all on a asus a8n32-sli deluxe motherboard
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