This ought to have been in the Gamerz section.
Anyway, as you say that the game gives an error while installation, the installation disk must be corrupted. Try to see if the shop keeper agrees for a new copy in exchange for this one.
In case he doesn't the next step will be more difficult. You will be required to send the game to the publishers so that they can send you a new copy. Now that would be quite a bit of a hassle.
One thing that you can do however is this. Since you say that you have the original game, you must be having the game CD key. Simply login to Steam with your account and register your HL2 CD key. Now under the names of "My Games", you will see that HL2 and a few other games listed. Now download the game contents via Steam and play.
I know downloading the whole game can be a hassle, but thats the best thing rather then sending it all the way to USA for a new copy.
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