The Half Life 2 Benchmark 2 on guru 3d among others might delete your autoexec.cfg. Make sure you use the in app update before you run it.
On a side note this is the first time I've seen half life 2 for 10 days and have been playing TCOR:EFBB (PC) for the last few hours and have to say the riddick beats HL2 hands down. Story, immersion (you see yourself and your shadow looks around when you do), interaction (no more mute characters!) all coupled with a GFX engine easily on a par with Doom 3 or hl2.
The only thing thing that seems to be lacking is the pysics of HL2.