Well, dammit. Portal was fun, but Half Life 2 and Half Life 2: Episode One keep killing my computer. "nv4_disp" causes an infinite loop. I haven't the patience to see if Half Life 2: Episode Two is the same way.
I updated my graphic drivers and updated DirectX, so I am stumped.
Oh, and totally hatin' on Steam. Totally hatin' on it. Takes too long to load, for one thing. And leaves annoying not-really-there windows on my Taskbar.