Team Fortress 2 Textures missing.

Hey, anything Team Fortress 2 that I spawn has the whole missing texture checkerboard thing going on. Anyone know how I fix this?

Have you tried actually buying it and not illegally downloading it?

http://img42.imageshack.us/img42/7263/dumbassr.jpg

Dumbass.

Can anyone ACTUALLY help? Instead of accusing me of stealing things that I legitimately bought?