Looks like a solid Machine. The reccomended requirements for WC 3
- 600 MHz processor
- 256 MB of RAM
- 32 MB 3D video card
- DirectX® 8.1 compatible sound card (Windows )
Unless the program shell is a hog you should be ok. With integrated Graphics it uses shared memory wich means it shares the main RAM with the rest of the computer.
You meet the reccomended requirements for Guild wars as well, But you may run into problems running GW nightfall your frame rates may be low