Go to the Gradle download page by entering the URL http://www.gradle.org/downloads in your browser.

Click on the latest Gradle stable release download link; at the time of writing this, the stable release is gradle-1.11-all.zip.

Once the download is finished, go to the downloaded directory and extract the ZIP file into a convenient directory of your choice.

Create an environment variable called GRADLE_HOME. Enter the extracted Gradle ZIP directory path as the value for the GRADLE_HOME environment variable.

Finally, append the GRADLE_HOME variable to PATH by simply appending the text ;%GRADLE_HOME%\bin to the PATH variable.