Try:
Rusty Hearts (I like the graphics, and it doesn't need a powerful pc)
League of Legends (awesome game, very light, about 2 gb size, a load of heroes to choose from, plus free hero rotations every week, though you may not like MOBA games)
Drakensang (browser MMORPG, no downloads, the graphics look good)
Dekaron (I'm a mod of the section and I can tell you that the game is just awesome, been playing for years now)
Alods (was a very pay to win game, but I hear that the situation changed alot)
Sign up for War of the Immortals (CBT on the 25th, I think)
Just PM me with what you need exactly and I'll help you out.