Hello everyone,
Please be aware of the minimum system requirements for Dirty Bomb.
http://i.imgur.com/zMIs86o.png
In addition, you can use the Can You Run it Tool to see if your system can run Dirty Bomb.
http://nxcache.nexon.net/spotlight/286/00IHs-d5e1fefc-63ae-4c3c-b3fd-d14253d0544b.png