I've been fooled twice, shame on me.

[richard.eid]

Navigate to C:\Users\username\Documents\Amnesia\Main and delete or rename main_settings.cfg

Try to launch the game again. Don't change any settings in the launcher, just hit 'Launch game' and see what happens.

I realize you have a bunch more games on Steam that run fine, but you are unlikely to get a second refund. I haven't heard of Settlers 7 problems like what you described, so I think it's fair to say that yours was an isolated incident. Maybe others have had the same troubles, but I haven't run across any forum posts where the issue wasn't resolved. The same goes for Amnesia so far.

I'm sure we can get your Steam version up and running, though. If you're up for it, that is. It sounds like you have a playable copy now anyway.