Instructions
Turn on your computer and plug the PS3 controller into your computer's USB port.
Go to the website hardcoreware.net/how-to-use-ps3-controller-vista/ and scroll down the page until you locate the phrase "download the appropriate drivers." Click on the words, which are in red text.
Open the driver software and follow the on-screen prompts to load the driver onto your computer. Then, restart your computer.