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Drivers.

For Windows 95 and 98, you need up to 4 drivers properly installed in order to have access to the higher video resolutions.

In order of recommended installation, the drivers are:

Chip-set drivers for your specific motherboard.
DirectX (from Microsoft) use the version required / supported per the information with the driver for your video card.
The actual driver for your specific video card.
The monitor driver if your monitor is not specifically supported by Windows default monitor drivers.

A good source for links to manufactures driver pages is www.driverguide.com

Chas