|where are you downloading this game from? something like STEAM or maybe it's just a free flash-based app or something?|
if you're talking about a torrent, no one here can help you (against forum policy).
what is the name of the "game installer in your pc"? Windows installs with an installation service, but that doesn't sound like what you're talking about, so i'm guessing it's some 3rd party software you installed previously? does it show up in Add/Remove Programs?