PCI adapter did not install
I don't know how you could have installed the drivers BEFORE you installed the hardware...
Shut down and UNPLUG the system; REMOVE the new PCI card, then hook up the power and boot the system back to the Desktop. Check the Device Manager to be sure you're not showing any problems; if everything seems back to normal, shut down and unplug the system a second time, then install the PCI card again, restore power, and prepare to reboot the system. Be SURE that ALL of the PCI cards are fully seated in the slots, and that the main power cable (from the PSU) is fully seated in the connector; IOW, check the system just to be sure that nothing has come loose while you've been working inside the case.
Next, boot the system again; Windows SHOULD detect the new PCI card during bootup, though it might NOT request drivers, if they are already embedded within XP itself...
Once you get back to the Desktop, open the Device Manager and check to be sure that the new card has been detected and properly installed. If you see any question marks, error messages, or exclamation marks, take detailed notes, and post that information here, so we can help you troubleshoot the problem...
Good luck; I can only give you general advice about this, because you didn't provide any specific details about your new hardware, but with a little luck, you'll get everything working without any more heartburn...
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