One common cause is that JRE 7 requires you to add the path to the path variable in windows.
Windows 2003\XP: You can verify by checking the qie_service.log file in the C:\Documents and Settings\All Users\Application Data\QIE\logs folder. You will see a "Failed creating java" error.
Windows 2008\7 and up:
If you have chosen to install the JRE version 7 in a windows environment then you will need to put the Java bin directory path into the “Path” Windows Environment System Variable. The bin directory path is usually “C:\Program Files (x86)\Java\jre7\bin”. For more information on changing the “Path” system environment variable visit:http://www.java.com/en/download/help/path.xml
