Not a lot of digital retailers offer money-back guarantees. Steam certainly doesn't offer it. Going against the tide, Good Old Games (GOG.com) has announced today that they are offering a worldwide money back guarantee on all their games, moving forward.
If a game is broken and you want your money back, GOG will offer you a refund for your purchase. Upon purchasing a game, you'll have 30 days to get your money back. Furthermore, if you bought a game by mistake (these things happen) or changed your mind about a purchase, you can get a full refund within 14 days as long as the game wasn't downloaded.
To that end, GOG has put together a FAQ sheet to answer any questions you might have about their new money back guarantee policy.
And finally, "even though this policy is introduced today, its effect goes back 30 days. If you bought a game within the last 30 days and have any of the trouble described here, contact us! We have you covered."
Steam could stand to learn a thing or two from these guys.