groze: There's no need to get all worked up about it, these are forums for discussing the games, people in here are community members and GOG users, same as you, we are no tech support team. I can recommend some things you could try, but it's hard to give you any kind of advice when I don't know the particular specs of your computer.
Things you should check are:
a) make sure the game isn't installed under the 'Program Files' folder, install it under something like "C:\GOG Games\Abe's Oddysee";
b) mess a bit with compatibility options, under 'Properties', when you right-click on the game's executable;
c) do a clean install -- uninstall the game, restart your computer, install it again, preferably running the installer as administrator;
If all of this fails, be sure to
submit a trouble ticket to GOG support. If they can't get the game to run on your computer within 7 days, you're entitled to a refund.
I'm sorry for snapping, but I always have to double to get a new thread noticed on the rare occasion that some goes wrong with a purchase. Also, I did pay money for the game, and I do like things I pay for to work, so I'm not sorry for that part. I'll definitely try the uninstall, though. Any particular reason it doesn't like Programs folder? I'm curious.