display adapter not device manager

Display Adapter not in Device Manager

I can't install drivers for my video card as there is no display adapter in the device manager. I do have the system devices to enable agp, no yellow exclamation marks, I can see a desktop, but no ability to update drivers.
System specs: Tyan Thunder 2500 (Serverworks ServersetIII HE chipset) 4 x 256MB PC133 ECC REG Onboard LSI U160 SCSI 18GB Seagate SCSI nVidia Quadro Pro or ATI Radeon 9500Pro (either video card results in the same problem: no display adapter in device manager and installing ATI or nVidia Vista drivers fails).
How to force enumeration? Is it the same as in XP?
thanks

Windows Vista

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