Java Web Start version 1.4.2_x   (What version do I have?)

1. Open Java Web Start (either the icon on your desk top or in your programs folder)
2. Click "File" then "Preferences"
3. Click the "Advanced" tab
4. Click the “Clear Folder” button. Then OK.
   
   
   
   
5. Close the Java Web Start Application Manager

Java Web Start version 1.5 (J2SE 5)   (What version do I have?)

1. Go to your Control Panel
2. Open Java (You may need to switch to "Classic view")
   
   
   
   
3. Click the “Delete Files” button. Then OK.
   
   
   
   
4. Close the Java Control Panel

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1. Open a Finder window
2. Choose "Applications", "Utilities", "Java" and open Java Web Start
3. Click the Java Web Start menu and choose "Preferences"
4. Click the “Clear Folder” button. Then OK.
   
   
   
   
5. Close the Java Web Start Application Manager