Step 1. Get USB thumb drive.
Step 2. Use a computer on the internet to find your NIC driver or CD driver (whichever comes first)
Step 3. Use thumb drive to install NIC driver/CD ROM driver
Step 4. Install you software
Step 5. ???
Step 6. Profit
Also Windows 98 might need drivers, but it very well shouldn’t be end of the world, because 98 was around when the internet was around so the drivers should be there.