When the equipment is originally installed, the drivers are added to Windows. Due to upgrades to Windows or errors in the drivers, new updated drivers are made available on the web. If you upgrade from 98 to Me, you may need to download new drivers for the equipment used by the computer. You need to know the manufacturer and model of the equipment, go to their site or search the web for updated drivers. Since HP makes a lot of equipment, it may take a little browsing to find the driver you need.
Most sites have a search feature or a download section to start in.
This works if you have Canon, Epson, Umax or Lexmark products. These downloads do not normally install automatically. Be absolutely sure you get the correct file for your model. Installing the wrong file may disable the device and be difficult to uninstall. I remind you here to install Go Back before doing any of this.