Can't start the Editor, or play games

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I have the most recent version of Java, and I am running a Vista machine. Whenever I try to open the Editor or play a game, I get this error:

JNLParseException[ Could not parse launch file. Error at line 20.]
at com.sun.javaws.jnl.XMLFormat.throwNewException(Unknown Source)
at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.Launcher.updateFinalLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.launch(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

EDIT: The Wrapped Exeption is as follows:


WARNING: <div> tag is not closed correctly Exception parsing xml at line 20
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parseXMLElement(Unknown Source)
at com.sun.deploy.xml.XMLParser.parse(Unknown Source)
at com.sun.javaws.jnl.XMLFormat.parse(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.jnl.LaunchDescFactory.buildDescriptor(Unknown Source)
at com.sun.javaws.Launcher.updateFinalLaunchDesc(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.prepareToLaunch(Unknown Source)
at com.sun.javaws.Launcher.launch(Unknown Source)
at com.sun.javaws.Main.launchApp(Unknown Source)
at com.sun.javaws.Main.continueInSecureThread(Unknown Source)
at com.sun.javaws.Main$1.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)