Graphical Issues because of Shader?

[Ristas]

Ok, i have a weird technical issue with Cryostasis.
When i look at the walls or at the floor i can see some white dots all over the place...i wont try to explain it but instead I´ll just show you screens of my problem (;

With Shader-Model 2.0:



With Shader-Model 3.0:




My System:

Intel Core 2Quad Q9450, 4x2,66 GHz
4 GB RAM
ATI Radeon HD 4870, 2 GB

So...is there anything i can do about that?
Thanks for your help...