^ This. Pretty much you're sitting on a dual-core processor with a semi-decent graphics card.
For context, hyper-threading is pretty much un-used outside of 3DS Max/Maya, Adobe Premiere, Final Cut Pro or other high-demand rendering/processing programmes.
You're not going to be getting 30-60FPS with this set-up.
If you invest in a decent quad-core (intel i2500k(and or equivilant) or higher) would work to your advantage.
Any average video card (with an average 1GB of memory) should be fine, they're running fairly cheap noawadays, you can easily get a solid range of 40-60fps with the aformentioned.
^ Bearing in mind you may need to purchase a motherboard compatible with a new processor, there may be an AMD equivilant of this.
^ Yet again, there may be an AMD equivilant of this.
(There are even cheaper parts than these, however this is a good example for an upgrade if you have a desktop capable of upgrading.)