Seems to be a strong computer;
You have the Duo Core 2.66 GHz, thats pretty strong.
You have a 320 GB harddisk and WITH 7200 rounds per minute (thats important, 5400 is too slow)
I haven't tried a graphic card like that, but with 512 MB it should be good enough.
22 inch flatscreen is nice too, just remember to keep a small distance or you will mess up your eyes.
Motherboard seems nice too, since it can handle these properties.
All in all I would say its a pretty nice computer, and I think it would run most games smooth.