Completely remove all Apple software (iTunes, Apple Application Support, Apple Mobile Device Support) from your Control Panel.

Make sure you are running iOS 6.1.3, 6.1.4, 6.1.5, or 6.1.6. Run p0sixspwn.exe as an administrator. Connect Device: Connect your iPhone/iPod to the computer. The software should say "Identified: [Your Device]". Jailbreak: Click the "Jailbreak" button. Let it Run:

If you prefer not to uninstall your current version of iTunes, you can manually inject the missing 32-bit files into the p0sixspwn folder.

Disable your screen lock passcode (Settings > General > Passcode Lock). Ensure you have a stable connection to your computer.