I've installed vMix Beta 3. When I try to start the program a vMix error message is diplayed:
"Graphics hardware not supported. DirectX 9 hardware required. D3DStartup."

The following is my system as reported by dxdiag. I can provide more of the report if needed.
It is very lengthy.

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System Information

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Time of this report: 5/16/2011, 18:30:23
Machine name: JEFF2
Operating System: Windows 7 Professional 64-bit (6.1, Build 7600) (7600.win7_gdr.110408-1633)
Language: English (Regional Setting: English)
System Manufacturer: ECS
System Model: G31T-M7
BIOS: Default System BIOS
Processor: Intel(R) Core(TM)2 Quad CPU Q9300 @ 2.50GHz (4 CPUs), ~2.5GHz
Memory: 4096MB RAM
Available OS Memory: 4086MB RAM
Page File: 1635MB used, 6535MB 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: 6.01.7600.16385 32bit Unicode

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DxDiag Notes

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Display Tab 1: No problems found.
Sound Tab 1: No problems found.
Sound Tab 2: No problems found.
Input Tab: No problems found.

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DirectX Debug Levels

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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)

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Display Devices

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Card name: Intel(R) G33/G31 Express Chipset Family
Manufacturer: Intel Corporation
Chip type: Intel(R) GMA 3100
DAC type: Internal