If you changed the title I would gladly do so...

Fortix

Well I can recommend the Still Life games (point-and click adventure type of game). Nice story.

For Tycoonish-games I'd say Vegas: Make it Big.

Hotline Miami is a very decent top down, retro-style shootergame (I'm sure you've heard of it).

Further, I can recommend Terraria, Dungeon Defenders (maybe your pc will run too slow when a lot is happening on screen though), Don't Starve, Gnomoria, Mark of the Ninja (in sale now)...

Take you're pick.

A.R.E.S.

Don't Starve
Mark of the Ninja
Bastion

Check http://gocdkeys.com/index.php

I like FTL and Trine. Dungeon Defenders can be fun but you need to level up a character a lot before you can get access to the rest of the game. I really like the art of Don't Starve and a valley without wind was fun for a bit but not much after that. Cave Story was a great shooter game with a fun story. Play Braid. Play Bastion. And I loved Magicka, but I also love Star Wars so I got a lot of the references.

Why STEAM games? Just play HOMM3 :P

I just started playing Gnomoria and it's pretty nice ;)

ragnarok online 1

Dungeons of Dredmore

Since you have some adventures on your wishlist try the Blackwell games or Deadalic like Edna & Harvey 2 or A New Beginning (both on indiegala right now).

Try Crysis 3 or The Division if it's realeasing on PC.

Try Unepic http://store.steampowered.com/app/233980/

Thomas Was Alone, Nightsky, Gunpoint, Mark of the Ninja, Abe's Oddysee. Mark of the Ninja might not work. I also don't know if you have any of these in your library already, I wont check because it's better for everyone to know these games anyway.

EDIT: Flatout 2 and Insanely Twisted Shadow Planet are also epic. And Red Orchestra Ostfront. But I don't know if any would work. I haven't heard of such a bad videocard in alot of time, I don't know where to place it.

what about mount and blade warband ?

Terraria, Waking Mars.

doom2d

hotline miami
mark of the ninja(on sale right now)
binding of isaac

Awusumnauts (Awesomenauts), Psychonauts, Castle Crashers, Spellforce, Hotline Miami, etc. Want moar, mighty Gaara?

torchlight has a netbook mode and is currently free on gog.com

Yeah, purchased HiB Android 6 :D

Flatout will work on your computer, and it's cheap and fun.

Counter-Strike: Source offered me hundreds of hours of fun with my extremely old computer (I had ATI Radeon 9800, which is better than your card though). I see you've played 6 hours of CS so not a big fan I guess.

Half-life 1.