Error initializing Direct3D renderer

[elavx]

hola, el verano pasado me baje el regnum y me anduvo muy bien. Despues tuve que desinstalarlo y ahora lo quiero jugar y luego de poner Entrar al Mundo me salta "Error initializing Direct3D renderer". Le spido que me ayuden.
Estos son los datos de mi compu:
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.080814-1236)
Language: Spanish (Regional Setting: Spanish)
System Manufacturer: INTEL
System Model: P4I45Gx_PE,
BIOS: Version 1.00
Processor: Intel(R) Celeron(R) CPU 2.26GHz
Memory: 504MB RAM
Page File: 355MB used, 874MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
Diag Version: 5.03.2600.5512 32bit Unicode

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Diag Notes
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DirectX Files Tab: No problems found.
Display Tab 1: No problems found.
Sound Tab 1: The file als4000.sys 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 2: No problems found.
Music Tab: No problems found.
Input Tab: No problems found.
Network Tab: No problems found.

Por favor ayuda