This article was previously published under Q219336
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When you install Windows NT 4.0 Service Pack 4 on a computer that already has the Number9 Revolution3D Accelerated Graphics Port (AGP) display adapter driver software installed, the display adapter driver software is replaced with the default VGA driver software.
To resolve this problem, obtain the latest service pack for Windows NT. For additional information, click the following article number to view the article in theMicrosoft Knowledge Base:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows NT version 4.0 Service Pack 5.