Instructions
Download the DualShock controller Windows driver--additional software that helps your computer interact with the controller--by clicking "Download" and following the installation wizard. When it offers to download the DS3 tool, accept it.
Plug your PS3 controller into your computer through a USB port. Desktop computers often have USB ports on their back side, while laptops often have USB ports along their sides. Connect to the Internet at this point if you aren't automatically connected.
Run the DS3 Tool that you received during the driver installation. Ignore the steps listed, which only applied to 64-bit systems when there was no 64-bit driver (there is now). Click "Load" to receive additional USB drivers.