SRL is a crap site. It claims I can't run:
Left 4 Dead
The Orange Box
Star Wars Battlefront
StarCraft II
GTA: San Andreas
Star Wars Republic Commando
Halo: Combat Evolved
And I can with my crappy onboard graphics. Because I'm a fucking boss and the Vista OS is my personal bitch. The site just isn't reliable at all. If you know nothing about computers, then it's okay, I guess.
As for you, you've got a dual core clocked at 3GHz and a pretty good graphics card. You're fine with running DCUO. If you are running Vista, I recommend turning off some stuff to make game playing more smoothly. And since I'm nice, I will even link you to a guide to make Vista run more efficiently:
http://www.ehow.com/how_5146437_make-vista-run-faster-efficiently.html
You also might want to turn off some background stuff like anti-virus software and pretty much everything that is not necessary to run the operating system. Then you should be able to run it on high.
