couldn't load "r_opengl.dll"

I know millions of others have probably gotten this error, but I need help with it too. I don't know how else to explain it, but this shows up every time I try to run SRB2 2.0.6 in OpenGL mode.

Specs:

System:

Operating System: Windows Vista™ Home Premium (6.0, Build 6001) Service Pack 1 (6001.vistasp1_gdr.100608-0458)
Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.
System Model: Inspiron 1545
BIOS: Phoenix ROM BIOS PLUS Version 1.10 A10
Processor: Intel(R) Core(TM)2 Duo CPU T6500 @ 2.10GHz (2 CPUs), ~2.1GHz
Memory: 2008MB RAM

Display:

Card name: Mobile Intel(R) 4 Series Express Chipset Family
Manufacturer: Intel Corporation
Chip type: Mobile Intel(R) 4 Series Express Chipset Family
DAC type: Internal
Device Key: Enum\PCI\VEN_8086&DEV_2A42&SUBSYS_02AA1028&REV_07
Display Memory: 780 MB
Dedicated Memory: 32 MB
Shared Memory: 748 MB

Above specs taken from my dxdiag.txt.

EDIT: I looked in the log and saw "GetLastError: Invalid access to memory location." What does it mean?

1. That integrated chipset is nowhere near what you need to run SRB2 in OpenGL. Get a discrete graphics card (any one that supports OpenGL will do.)

2. Is r_opengl.dll actually in the SRB2 directory? If its 2.0.6, it should be... I think

1. Unfortunately, the only way I can get a better graphics card is by getting another computer that has a dedicated graphics card, and I'm not about to drop money I don't have on another computer.

2. r_opengl.dll is indeed in the SRB2 directory

Your computer has a built-in slot for putting in a graphics card, pretty much every one available can run SRB2 well, even the cheapest ones can run it well at low-to-mid resolutions.