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ValveTime.co.uk | Valve News, Forums, Steam
Sorry if this is old news, but for all those who crash after the load screen, I have a fix that worked for me.
right click on properties, add...
-dxlevel 70
...to your desktop shortcut to half life 2. That defaults directx to v7, instead of v9. Apparently a lot of the crash problems have to do with some new direct x features that other games don't use.