How do i make my GPU as my gravity computation device

[A Wise Limey]

My computer has some issues running US2. How can I change my GPU so its the gravity computation device? Or is their a way so US2 utilizes my 2.6 GHz duel core CPU?
Here's my PC specs

HP Pavilion p6-2016 Desktop PC
_______________________________________________________________
 Processor

 Pentium G620

•Operating speed: Up to 2.6 GHz

•Number of cores: 2

•Socket: LGA1155

•Bus speed: DMI (Direct Media Interface) - 2.5GT/s

 _______________________________________________________________

 Memory

 6 GB

•Amount: 6 GB

•Speed: PC3-10600 MB/sec

•Type: DDR3-1333

 _______________________________________________________________
 Video graphics

 Intel Graphics Media Accelerator HD Integrated graphics (DX10.1)

 *Integrated video is not available if a graphics card is installed.

•Supports PCI Express x16 graphics cards

•DVI and VGA ports (both ports can be used at the same time)

Here's more info on my GPU
Version:  Direct3D 9.0c [igdumdx32.dll 8.15.10.2291]
    Renderer: Intel(R) HD Graphics Family
    Vendor:   Intel
    VRAM:     880 MB (via DXGI)
    Caps:     Shader=30 DepthRT=1 NativeDepth=1 NativeShadow=1 DF16=1 INTZ=1 RAWZ=0 NULL=1 RESZ=1 SlowINTZ=0



I'm new to this, sorry if the added 'help please' is in appropriate. If so, just let me know, I won't do it again. 

[C7]

If you could, run a performance test from the menu, and submit feedback of your report. Add Atten : C7 to it, and I'll look it over when it comes in.

Looking over the computer specs you've provided, you don't actually have a traditional GPU, it's an integrated chip on your processor.

Likely, your CPU is your best computation device in your system. However, to utilize your processor to its maximum potential we need to be able to run OpenCL on your computer. The performance logs will tell me if that's happening or not. If you're not running OpenCL we can see about getting the right drivers installed.