title: Java 7 64 bit on windows 7: how to switch java versions
body: <p>I need to switch from the installed java 7 at 64bit to the installed java 6 on my Windows 7 64bit OS but the usual procedure doesn't works.
  I tried to change the JAVA_HOME environment variable but when I type java -version, the system replies Java 7...
  How can I switch from different java versions?</p>
  
  <p>Thank you.</p>