Unzip the files to a temporary directory and perform the following -
To install Win98 AGP driver
1. Go to device manager, expand system device, right-click on the PCI standard PCI-to-PCI bridge.
2. Select the "Driver" page and press the "Update Driver" button. Go through the "Display a list of all the drivers in a specific location" page select "Have Disk"
3. Enter the location of your new INF and driver.