Core detection

Hi,

I'm setting a scene with a dual core processor, then I transfer it to another computer for calculation. The comupter is not in my network. So I cant use DR.The first computer has Solidock and the other one not. When I render the scene on the 8 core computer, the CPU usage is 25 %.. I guess the scene is set up with 2 core detected on the first computer. How can I make this 8core computer use all cores ?

Thanks

Sego