Rainbow Six Vegas not working?

Hello, I recently downloaded "Rainbow Six Vegas" and "Mass Effect" through steam a day or two ago. Mass Effect works just fine but Rainbow Six Vegas doesn't seem to work. What happenes is I click launch through steam and it says "Rainbow Six Vegas is preparing to launch." Soon... show more Hello,
I recently downloaded "Rainbow Six Vegas" and "Mass Effect" through steam a day or two ago. Mass Effect works just fine but Rainbow Six Vegas doesn't seem to work. What happenes is I click launch through steam and it says "Rainbow Six Vegas is preparing to launch." Soon enough that just disappears and nothing happens, any help? I'm am using windows vista.
Thank-you for your time
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