leonardo, i'd also recommend you finding good review sites and magazines (pc gamer, ign, gamespot) but only if you think that your game is worth a good rating, if it is then you will have tons of readers of pc gaming magazines and websites looking at your game, which can really alter your numbers, and even if they don't think your game is perfect, there are the ones that will check it out just because the game is there, and seems interesting

make and sell soundtracks, if your game has a decent soundtrack then most will buy it and it's a great way to get money aside from the games