title: java virtual machine launcher error: unable to access jarfile
body: <p>I have downloaded a program to run on windows XP. 
  According to the instructions, opening the .bat file that includes the command that calls the .jar file would be enough.
  Yet the program does not open.
  In a friend's computer the program does open.</p>
  
  <p>I have set correctly the java-related environment variables. Java works fine. I have associated .jar files with java sdk. </p>
  
  <p>When calling the command
  javaw -Xms128M -Xmx512M -jar filename.jar from cmd
  I get a java virtual machine launcher
  error: unable to access jarfile</p>
  
  <p>Then I called the same command while being on the folder where the jar is, I have no error, but still the gui of the program does not open. </p>
  
  <p>Any ideas?</p>
  
  <p>On windows support the suggest unistalling and manually re-installing  java, but java works fine in any other app.</p>