Hi Robin,
Welcome to the forums!
Everything on your system seems to be capable of running SSE although your graphics card is just below the minimum required to play the game. You might just about get away with it though.
The demo is going to be released in September at some point, so you could either wait for the demo or chance it by purchasing the game.
As I said, the rest of your system is fine, but the card may or may not be able to handle the graphics to an acceptable level.