If you are still using your current Windows operating system, you should upgrade to DirectRT v.2010.3.109. You can download it here: http://www.empirisoft.com/download_old.aspx.

If you are using Windows 7 or later, I would encourage you to try a copy of DirectRT v.2014.1.104. You can download it here: http://www.empirisoft.com/Download.aspx?index=4.