title: Unable to install Android ADT Plugin for Eclipse Helios 3.6.2
body: <p>I am a new Android developer. While trying to install the ADT Plugin for Eclipse on a Win 7 system, I encountered this warning:</p>
  
  <pre><code>Warning: You are installing software that contains unsigned content. The authenticity or validity of this software cannot be established. Do you want to continue with the installation?
  </code></pre>
  
  <p>I clicked the 'OK' button to proceed, and was greeted with another pop-up window bearing the following message:</p>
  
  <p>Problem occurred:</p>
  
  <p>'Installing Software' has encountered a problem.</p>
  
  <pre><code>An error occurred while installing the items
  session context was:(profile=SDKProfile, phase=org.eclipse.equinox.internal.p2.engine.phases.Install, operand=null --&gt; [R]com.android.ide.eclipse.adt 10.0.1.v201103111512-110841, action=).
  Failed to prepare partial IU: [R]com.android.ide.eclipse.adt 10.0.1.v201103111512-110841.
  </code></pre>
  
  <p>Rebooting my machine did not help, neither did reinstalling a fresh copy of Eclipse.</p>
  
  <p>Any help will be be appreciated!</p>
  
  <p>Thanks!</p>