Blood texture missing

Dear Community,
In my Garrymod the bloof texture is missing.Istead of blood suqirting out when you shoot a NPC black squares are coming out.I want to film Machinimas so this is very annoying, I reinstalled Garrysmod,Half Life 2 and even whole Steam(!) completly.
Does some one know how to fix this?
Regards, Jack

Does no one know?