Modle turns back

I was building a model where it requires a good amount of different parts and assemblies to be added. At a certain point the model turned black and when I pan around the part it is moving slow. I believe it is because the graphics card can not handle it but I cannot find a solution or evidence this is true.

I am using windows XP with a

intel(r) 82945G express chipset family graphics card

thank you for any help

SolidworksAssemblies