Are there some good drivers available to make the PS 3 controller work with Windows 7?
Also, can I use it wirelessly?
I have successfully used an app called DS3 Tool to use a PS3 controller on Windows 7 64 bit. I did do it by cable though, it does also apparently work with bluetooth.
It was a bit of a hassle to get setup, but once it worked allowed a lot of customization and worked very well. Just follow the setup instructions closely.
I think Windows will be able to fetch the driver for you automatically. Linux should work out of the box.
If you want to use it wirelessly, check out this guide:
Note that the controller connects via Bluetooth so an ad-hoc network (Wi-Fi) won't work. You'll need a Bluetooth dongle.
If you're not too tech proficient, it might be best to just use it wired and if necessary, buy a longer USB-to-microUSB cable.