PCI Graphics card trouble

I’ve got a (old) Dell Optiplex GX1 500Mtbr+ running Windows XP. I want to install a Rage 128 PCI card (w/ TV tuner), and by all accounts, it should be pretty easy. The integrated video shuts off automatically, and the PCI card works as the BIOS POSTs, but then as soon as Windows loads the signal is lost.

I deinstalled the integrated video and deleted the drivers, and tried to install the 128 drivers before physically installing the card, but the setup program quits after it realizes the PCI card isn’t yet installed.

So to sum this sad saga up, can anyone explain just what the heck I’m doing wrong?