Windows 98 runs fine on emachines. You simply need to install the drivers for the video card and modem. Do you have any driver cds that should have come with the system? If not, check Gateway's website (they bought emachines).
As AcaCandy already said, you need to install the drivers for the display adapter. The type of display adapter should be listed on the label on the case or in the documentation that came with the computer. If it is currently running in the Windows VGA mode, I doubt that it will appear in the Device Manager under Display Adapters.
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