model skins not showing

I am new to hammer and i created a simple level, just a box with a few enemies and a shotgun + box of shells but when i test run from console in hl2 it loads fine but there r no skins on the models except that the green dots on the pistol do show.

thnx in advance 4 answer

What entities did you use for the models ?

i'm having a simular problem... only it's in hammer it self.... when i load a model it's has no skin.... it's just all black. the method i'm using to put it in(just in case i'm doing it wrong since i'm still new to maping) i add an entity, then set it as a npc_furniture. then set the model to a car or that dog thing......apply it and none of them have skins.they just apeer black. yet on a freinds computer using the same prosess it shows up just fine.... is this a setting i need to tweek or am i just going about adding this stuff the wrong way???