title: How to reset environment variable set with setx in Windows?
body: <p>Initial state: <code>ABC_HOME C:\abc\bin\</code></p>
  <p>In the batch file the variable is changed:</p>
  <pre><code>setx ABC_HOME &quot;%ABC_HOME%;E:\newAbc\abc\bin\&quot;    
  </code></pre>
  <p>How can I return to the state <code>ABC_HOME C:\abc\bin\</code>?</p>