Texture Blackness

[Zippy]

Sometimes when I look up or down a little, my textures will go black. And if I move back my textures will come back. The updates did this because this never happened before. My GFX card is a GeForce FX 5500 256DDR. How do I make this stop happening? I tired out all my settings, come to find out my textures stay black when my Shadow Detail is on low, when on High, it does the same thing I just explained. It will do this with objects and NPC's sometimes. Please, help me it's really annoying. This happens in both Garrys Mod and HL2.

 

[DiSTuRbEd]

Validate your HL2 files first, come back if it doesn't solve that issue.

 

[Zippy]

Sorry for being stupid, I don't know what you mean.

 

[Shodan]

Copy this into your URL/address bar.

Steam://validate/220

It should check and repair all the Half-Life 2 GCF files.

Edit: D: Really? I should get with the times.

 

[diluted]

You can do this through the Steam GUI now..
Right-click Half-Life 2 in Steam, Properties, Local Files, Verify Integrity of game cache.