title: Can't install JDK 9 because "Another Java installation is in progress"
body: <p>I have been using JDK 9 on Windows 10 x64 for a while but when I went to install the latest early release (b174), I first uninstalled the previous version (as usual) and then ran the new installer.</p>
  
  <p>It fails with a message box saying "Another Java installation is in progress. You must complete that installation before you can run this installer".</p>
  
  <p>It seems there are some artifacts around causing the problem but only for JDK 9 as I can uninstall &amp; reinstall JDK 8 without any issues.  Also, the same problem occurs if I try to run the installers for any prior JDK 9 releases as well (even though they worked before).</p>
  
  <p>Searches have suggested various options like using a Microsoft MSI clean-up tool and registry hacks but nothing is helping.</p>
  
  <p>Can anyone suggest a way to get JDK 9 installed (as now I cannot use any release of JDK 9 at all)?</p>