For a successful installation, download the Eclipse Classic 3.5.1, instead of Eclipse IDE for Java Developers.

  1. Unzip it to a directory, eg, C:\Program Files
  2. Launch Eclipse, eg, C:\Program Files\eclipse\eclipse.exe
  3. Help, Install New Software, add https://dl-ssl.google.com/android/eclipse/
  4. Then, check Android DDMS and Android Development Tools.