Sometimes the Java installation gets corrupted. First thing to try would be to uninstall LW and all Java on your system. Then rebooting and downloading the newest Java version (JRE offline installer). Install it and reboot again. Then install LW again. The Java you can get here:
http://java.sun.com/j2se/1.5.0/download.jsp

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"Never Argue With An Idiot. They Will Drag You Down To Their Level, Then Beat You With Experience"