Here is a more clear set of directions:
1. Download and install
Samsung_USB_Driver_for_Moblie_Phones_v1_4_6_0.
2. Connect phone to PC via USB.
3. Enable USB debugging.
4. Download and install Pdanet on both your computer and phone.
Windows 32-bit or
Windows 64-bit
5. Download and extract superboot folder, place it on C:/ and rename it to "root".
Download Superboot
6. Power down phone.
7. Boot into bootloader(press and hole volume +/- simultaneously and power).
7a. On PC go to Start>Run and type "cmd" and hit enter.
7b. Type "cd.."(repeat until your at C:/)
7c. Type "cd root"
8. Type "fastboot-windows oem unlock" to unlockbootloader.
9. You'll receive warning about unlocking. Use volume + to highlight and power to confirm.
10. Click "install-superboot-windows.bat" that is in your "root" folder on C:/.
11. You should now have unlocked bootloader and root access.
Note: Phone will reboot and may take up to 5 minutes. If you get stuck at Google screen past 5 minutes
do a battery pull. After it's booted check for Superuser app and update(even if it says it's up to date).
Reboot after updating Superuser app.
Done.