This will help if you installed a wrong driver
Matrox,
7 MB
Key features? Support for high-quality, grayscale, stereo-3D monitors (for example, Siemens SMM 21106 LS)?
Matrox DualHead to use 2 monitors at a time (in independent or clone mode)? 64-bit, 66 MHz PCI card compatible with all PCI and PCI-X slots? 256 MB graphics memory?
Matrox UltraSharp Display Output Technology? Multi-card, multi-display 2D/3D OpenGL and Microsoft DirectX acceleration? Hardware support for quad-buffered stereo-3D output? Unified Microsoft Windows 2000 and Windows XP display
Driver for
Matrox Parhelia series graphics cards? Matrox-certified display drivers available for leading GIS software? Easy-to-use Matrox PowerDesk
Driver interface? Matrox Clone to view a copy of one display on the other display? Support for special aspect ratios (for example, 1024 x 1024)? Support for customizable unattended installation for rapid multi-system setup? Global sales and technical support? 3-year warrantyIt is highly recommended to always use the most recent
Driver version available
Parhelia,
Problems can arise when your hardware device is too old or not supported any longer
Vista,
Try to set a system restore point before installing a device driver
32bit,
OSSupport:Windows
Vista Size:13
Driver,
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HF,