java.util.prefs.WindowsPreferences WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0x80000002. Windows RegCreateKeyEx(...) returned error code 5

Dennis answer is correct. However I would like to explain the solution in a bit more detailled way (for Windows User):

1. Go into your Start Menu and type regedit into the search field.
2. Navigate to path HKEY_LOCAL_MACHINE\Software\JavaSoft
3. Right click on the JavaSoft folder and click on New -> Key
4. Name the new Key Prefs and everything should work.