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Step 1: Insert the driver CD into your computer and install the driver software. Do not connect your webcam yet. The CD should autorun and install the drivers.
In some cases, your webcam will not require a driver and therefore may not have a CD. In that case, you can just plug the webcam into a USB port on your computer. Windows should recognize it and attempt to install default webcam drivers. Usually this is what you can expect if your webcam doesn't come with a CD.
Step 2: Connect the webcam to a USB port. The installed software should start, or you can start the webcam software from the Start menu. Most instant messaging software, such as Skype, will recognize the connected webcam as the default device and automatically configure it.