A driver is software that allows your computer to communicate with hardware or devices. Without the correct driver, the hardware or device that you want to use won't work properly. Here are some recommended links:
What is a driver?
Automatically get recommended drivers and updates for your hardware
What to do when a device isn't installed properly
Update a driver for hardware that isn't working properly
Restore a driver to its previous version
Find and install printer drivers for Windows 7
