I have only tested this on Windows 7 SP1 x64
Before continuing you will need a Bluetooth Dongle Compatibility with MotioninJoy if you want wireless support.
I recommend the TRENDnet TBW-107UB. (PlugNPlay, no extra software needed.) It can be found at Newegg, Amazon and Fry's. Works up to 30 feet away.
Unfortunately cheap dongles you find on eBay will NOT work.
And you will need a Mini-USB cord. (DualShock 3 is Mini USB not Micro USB)
Installation and Configuration:
After you have the Bluetooth Dongle connected to your computer, download and install the MotioninJoy software. [Direct Link] [Official Website (Download version 0.7.0000(testing)]
After installation, follow this guide (Connect controller via USB > Open DS3 Tool > Click BluetoothPair > Click Pair Now)
After it's paired remove the USB then click on Profiles on DS3 Tool. Select Xbox 360 Controller Emulator then click Enable.
That's it! Your DualShock 3 Wireless Controller should now work on supported PC games like GTA IV, Need for Speed World, Street Fighter IV and Saints Row the Third.