Bad aliasing

Set the nVidia Control Panel AA to application control and use the game presets and see if that changes anything.

Are you using Multisampling or Supersampling in your control panel?

Also be aware that HL2 can only go up toe 6xAA (which can only be achieved by ATi hardware) and 4xAA for nVidia hardware.

Ep2 can go all the way upto 16xAA
 
Looks like no aliasing at all is going on. IIRC there's a bug if you have AA set to 6x in HL2 where none gets applied - something to do with nVidia cards and the way they do AA. The only alternative is to switch to 4x in the in-game settings or 8x+ in the control panel. DON'T set AA to 6 samples in the in-game options.

If this doesn't apply to you, make sure your AA is set to 'application controlled' in nVidia control panel. Are you managing your graphical settings with any 3rd party programs like nhancer, etc? Same applies to them, make sure they're not forcing AA to off or anything.

Edit: *shakes fist*
 
That might be it, in control panel all the way up to 16XQ, and in the options for the game it's at 6x.
 
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