It works fine on windows 7. (that's what I use)
You will need to manually install the driver:
Plug in unit
Cancel driver search
Right click "computer" on the start menu and chose "Manage"
click "Device manager" on the Left
Right click on the interface, which will have a yellow mark on it and choose update driver
click Browse my computer and point it at the drivers folder on the cd you have.
Click "install anyway" when it tells you the driver is not signed
Job done.
Now start the flashing tool, plug the other end into the car and turn on the ignition.
Click "Read ECU data" to confirm everything is good
