As of now, redsn0w needs further testing on Windows PC’s and is currently only available on Mac OS X x86 because of this. The guys over at the Dev-Team Blog have posted the instructions on how to proceed with this jailbreak. The directions are as follows:
If you’ve already updated your device to 4.1 or 4.0, the next steps are:
1. Launch the beta redsn0w 0.9.6b1
2. Select your stock 4.1 or 4.0 ipsw (you’ve already used this to update your device to 4.1 or 4.0)
3. Select “Install Cydia” and any of the other options shown above, then click “Next”. Use DFU mode to install the jailbreak.
Note: If you choose to “Enable battery percentage”, you actually toggle that off and on via Settings->General->Usage.
You can always count on those guys to help you out with your jail-breaking needs. Have any of you tried this? Post your results in the comment section below.
source: Dev-Team Blog