|"direction quite specific about that order"|
You never mentioned the model of your card, so I checked the Belkin site & grabbed the instructions for a 4-port USB 2.0 PCI adapter card. Interesting that the last setp (step 10) is when they mention installing the drivers:
1. POWER OFF THE COMPUTER AND DISCONNECT THE
2. Remove the screws that secure the computer cover and remove the cover.
3. Touch any metal part of the case to ground yourself. This will discharge any static electricity that could damage
4. Locate an empty PCI expansion slot.
5. Confirm that the 4-Port USB PCI Card will fit into the slot you have chosen.
6. Remove the port cover from the back of the PC which corresponds to the PCI slot you selected. If there is a screw, place it in a safe spot as you will be using it to attach the 4-Port USB PCI Card.
7. Push the 4-Port USB PCI Card firmly into the slot. Apply pressure as needed until the edge connector is fully seated.
8. Now secure the 4-Port USB PCI Card with the screw that you previously placed in a safe place.
9. Replace the computer’s cover.
10. Now that the 4-Port USB PCI Card is installed, you can replace the power cable. Proceed to the next section, “Installing the Software Drivers.”
I suggest you remove the card & uninstall the drivers. Boot into safe mode, go to Device Manager, then check every single entry & look for duplicates. If any are found, remove ALL entries for that specific hardware device. For example, click the "+" next to CDROM. If you only have one drive but it's listed twice, remove both entries. Then move on to disk drives & do the same thing...continue all the way down the list.
Also while you're in safe mode, run CCleaner, both the cleaner & registry scan...remove everything it finds.
Boot back into Windows & wait for it to reinstall all the hardware devices you removed. If you're prompted to reboot, do so. Once all the hardware is sorted out, shutdown, install the USB card, reboot & install the drivers.