My advice would to try google. I'm not good at explaining things so I won't try. Just mess around with it you will get the hang of it. I found a mini-nuke in the editor.........its pretty sweet. Oh and by the way some of the models don't work or work incorrectly as it isn't the full version
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AMD Phenom 9500, 4GB DD2 1000 G.Skill ram, MSI K9A2 Platinum motherboad, ATI HD3850, 320GB X2 SATAII drives