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#21
thack3r Your best solution is to simply uninstall HL2 while saving things like game saves, etc. once you log out of Steam. The problem is mostly game driver related with a few game files corrupted.
Once you have it removed you log back in and bring up the main library, news screen and go into the games screen. You should see HL2 not install with a button to reinstall the game. That should be able to clean all this up for you.
The option there will download and install fresh game files from the Valve servers. Once you have it on again lower the screen resolution setting in the game itself down a notch. You may want to download the redistributable package for DX 9 Full and run the installer for that as well to refresh the 9c drivers if you had previously installed DX 9. If not the game is mainly DX 9 dependent.
If you are running an older ATI card NetFramework 2.0 is a requirement while 3.5 is the new minimum you would want on before going with the latest 4.0. The Windows updates should have already seen the 3.5 version installed by now anyways eliminating any worry about that being any problem.