Gmod Error?

Ok well, My garry’s mod works on my new computer. And it works on all maps! But when i load any Cs maps, or any other games map. it gives me the error…

Engine Error

failed to lock vertex buffer in CMeshDX8::LockVertexBuffer

Anyone know what this is?

Edit: Shit, Wrong forum. sorry

Do the maps work in their own games? You may have to run the game once, for example CS:S, to use CS:S maps in gmod.

PC specs please.