When I try to launch I keep getting "Error creating effect grassbillboards" I a mechanic not a computer guy so any help would be great here is a list of what im running on my computer.

Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_rtm.040803-2158)
Language: English (Regional Setting: English)
System Manufacturer: Hewlett-Packard
System Model: Pavilion ze8500 (DS541U)
BIOS: PhoenixBIOS 4.0 Release 6.0
Processor: Intel(R) Celeron(R) CPU 2.60GHz
Memory: 702MB RAM
display Devices
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Card name: RADEON IGP 345M
Manufacturer: ATI Technologies Inc.
Chip type: RS200M AGP (0x4337)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_4337&SUBSYS_0850103C&REV_00
Display Memory: 64.0 MB
Current Mode: 1024 x 768 (32 bit) (60Hz)
Monitor: Default Monitor