I'm currently running on windows 7. I found a lot of great info here: https://bitcointalk.org/index.php?topic=390929.0
Start with only one plugged in first then, after you have the first one running, plug in the others. You also need this in you .bat file using 0781 will give you stock speeds, 0881 will be about 1.8gh/s, 0981 is about 2gh/s