Install WinNT4.0 SP6 display Driver manually.

1. Install VIA 4IN1 v4.47 from [CD-ROM]:\Drivers\VIA\4in1\446VP6.EXE 

2. Reboot system and click right button of mouse.

3. Click "Properties".

4. Click "Setting"

5. Select "Display type"

6. Press "Change" button.

7. Select "Have Disk"

8. Select "viagfxk.inf" from [CD-ROM]:\Drivers\Display\NT_SP6

9. Press "OK"

10. Please restart Windows NT system.