The Chronic Dev-Team has released the Windows version of its Absinthe utility to perform an untethered jailbreak of the iPhone 4S and iPad 2.
You can download the utility from here.
We'll be posting Windows tutorials on how to use Absinthe below...
TUTORIALS Are Here:
● iPhone 4S How to Jailbreak iPhone 4S with Absinthe (Windows)
● iPad 2 How to Jailbreak Your iPad 2 Running iOS 5.0.1 (Windows)