Step 1: use this autoexec http://www.mediafire.com/?z9kmo59vzmcb637
and put it in ur Steam\steamapps\common\alien swarm\swarm
\cfg folder.
Step 2: put this in launch command: -console -high -dxlevel 81-
heapsize [read below] -noforcemaccel -noforcemparms -noipx -nojoy
Modify the heapsize command to match your the amount of RAM you
have in your computer (NOT video card memory!)
512MB -heapsize 262144
1GB -heapsize 524288
2GB -heapsize 1048576
3GB(max)-heapsize 1572864
Step 3: Use software vertex mode.
>From slideshow to playable. Worth a try!
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i have x3100, win7 32bit, sigma 3.0, 3gb RAM.
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9xx SOLDIERS SANS FRONTIERS