I have to admit that this is by far the most bizaare thing I've ever seen in installation history. Even Windows never went this far in any of its versions.
Well, as I was writing this, it completed "unlocking" HL2. BUT WTF was all that about anyway? It took me a 1/2 to do this step. This was like installing the game twice. Others had even more horrible stories of time wasted when any other game you buy ends up being available the moment you validate the game with the key. STUPID!!!!!