Follow the Tutorials :

• Download Android SDK from here and Install it on your PC.

• Open SDK Manager from the installed location and wait for the files to get fetched

• Once the fetching is complete select the packages you want to install. I selected the ‘Tools’ and ‘Android 4.1 (API 16)’ packages. Click Install 8 packages.

• Select Accept and Install.

• Wait until the packages are downloaded and installed.

After everything is downloaded, now set up the Android Emulator to run Jelly Bean on your PC.

• Go to Android SDK Tools folder and start AVD Manager.
• Click on New and Create a Virtual Device –> Create AVD –> Ok.

• Now select the virtual device from the list –> Click Start –> Launch.

You’ll see the following screen after the emulator starts up. The first time boot up will take a few minutes.

Enjoy Jelly Bean on your PC!

source : http://cyberjunkeez.org