Users of the Nexus S (both GSM and 4G variants) will certainly have reasons to celebrate as they can now easily root their beloved device using a one-click rooting solution.

Thanks to several enthusiastic members of XDA Developers, an enticing new PC-based software that can be used for both the Nexus S and Sprint Nexus S 4G models has been made available.

The handy application is very useful and can be a lifesaver for owners who still have second thoughts on trying out the complex and lengthy approach of rooting using Android Debug Bridge (ADB) commands.

Rooting can be a tedious process, most especially if it involves getting your hands dirty using ADB and tons of command lines that you need to input. Luckily, the new one-click procedure is easy to use even by first-time users who are reluctant to root their devices.

So, let’s cut to the chase and start rooting.  In the rest of this guide, you will learn how to root your Nexus S or Nexus S 4G with just a single click.

Instructions

1. Download the One Click Root for Nexus S / Nexus S 4G package file from here and save it to your desktop.
2. Extract the contents of the ZIP file without modifying or renaming any of the contents of the file.
3. Install the USB drivers for your Nexus S.  The driver installers are among the extracted files.  If you are on 64-bit Windows, run the file called PDANetA300x64.exe.  If you are on 32-bit Windows, use  PDANetA300.exe.
4. When prompted by the driver installer program, choose Samsung and say yes to any pop-up to start installing the Nexus S 4G / Nexus S drivers on your PC.
5. Enable USB Debugging on your device by heading to Settings > Applications > Development > USB Debugging. Make sure that there is a check mark beside that option.
6. Connect your Google Nexus S 4G / Nexus S to your computer via USB cable. Do not mount the SD card once you connect your device to your PC.
7. Launch the run.bat application as Administrator (i.e., right-click the file and select “Run as Administrator” from the popup menu). If the application gives errors, wait for about 2 to 3 minutes before trying again, as your computer might still be installing the device drivers.
8. Follow the onscreen instructions to start rooting your Nexus S 4G / Nexus S.
9. After the rooting program has finished its job, check whether or not your device is successfully rooted by installing the Root Checker or Superuser app from the Android Market.

Congratulations! You just successfully rooted your Nexus S 4G / Nexus S.  Enjoy the benefits of having a rooted phone as you can now install tons of powerful applications that require root access.