PROBLEMAS GRÁFICOS DIABLO 3

targeta gráfica Ati Mobility Radeon 4200, el diablo 3 me da problemas, las cosas no se ven bien (adjunto un par de screens para ver lo que pasa)
He buscado bastante por los foros pero nada de lo que pone me funciona, a ver si alguien me puede decir algo. Muchas gracias de antemano.

http://img860.imageshack.us/img860/6253/screenshot000l.jpg
http://img29.imageshack.us/img29/8035/screenshot001rpd.jpg

Adjunto tambien un dxdiag por si pudiera ser de ayuda

"
------------------
System Information
------------------
Time of this report: 5/15/2012, 23:33:35
Machine name: SIMELAS-HP
Operating System: Windows 7 Home Premium 64-bit (6.1, Build 7601) Service Pack 1 (7601.win7sp1_gdr.120330-1504)
Language: Catalan (Regional Setting: Catalan)
System Manufacturer: Hewlett-Packard
System Model: Presario CQ56 Notebook PC
BIOS: Default System BIOS
Processor: AMD Athlon(tm) II P360 Dual-Core Processor (2 CPUs), ~2.3GHz
Memory: 4096MB RAM
Available OS Memory: 3834MB RAM
Page File: 2721MB used, 4946MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.01.7601.17514 64bit Unicode

------------
DxDiag Notes
------------
Display Tab 1: The file aticfx64.dll,aticfx64.dll,aticfx32,aticfx32,atiumd64.dll,atidxx64.dll,atiumdag,atidxx32,atiumdva,atiumd6a.cap,atitmm64.dll is not digitally signed, which means that it has not been tested by Microsoft's Windows Hardware Quality Labs (WHQL). You may be able to get a WHQL logo'd driver from the hardware manufacturer.
Sound Tab 1: No problems found.
Input Tab: No problems found.

--------------------
DirectX Debug Levels
--------------------
Direct3D: 0/4 (retail)
DirectDraw: 0/4 (retail)
DirectInput: 0/5 (retail)
DirectMusic: 0/5 (retail)
DirectPlay: 0/9 (retail)
DirectSound: 0/5 (retail)
DirectShow: 0/6 (retail)

"