Instealled the game and CD key is invalid!

[JavieCoentr]

What should I do? I paid a lot for it, and the guy I bought it from doesn't want to answer my calls. Maybe you know a better way to find a valid key to unlock games?

[Frequenc1]

Yes, I agree with you .But where's the best place to buy PC games? Long-time PC gamers know that there's more to it than just signing up for a Steam account.
Steam is ubiquitous and monolithic but has disadvantages. There are other storefronts that sell game codes redeemable on Steam for less than the Steam store’s price or grant a better cut to developers.