Unwanted Shadowing (?)

So my gmod has these weird shadows on NPCs & Ragdolls and on the .357.

http://img824.imageshack.us/img824/7830/gmflatgrass0000x.jpg

I have reinstalled it twice now, updated HL2, ep1, ep2, and CSS. I have no addons, textures, toybox stuff, anything - it just installed.

                                              **Additional Details** 

I have Killingfloor, And Half Life 1 mods Sven Co-op and Opposing Force (steam) installed. I doubt that would interfere with anything but it may be a problem.

Are you using the Steam or non-steam version of GMod? I’ll need more info to help with your issue.

Try adding -dxlevel 81 to the command line (Right-Click Garry’s Mod in Steam and go to Properties (Start Up Options))

Thank you sir. My game works now and the textures are fine. The only problem is that NPCs sometimes crash the game.