immediate crash

please help i have the beta on steam and when i click play my screen goes black as the computer thinks for a few seconds then widows tells me the game has crashed?
what can i do??????

Upload your DxDiag.txt

thanks here is my dxdiag

you have got a quite old graphics card there. try updating your videodrivers.

the rest of your rig seems fine, however there also is a bug that crashes PA if no audio device is connected (so make sure there is)

thanks will try that now and get back to you

thank you, thank you, thank you, thank you, thank you!!

the update fixed my problem.