Vista 4 currently supports only a specific version of JAVA. To make sure you have the correct version, follow the instructions below on how to uninstall all versions of JAVA then install the most stable version of java below:

To uninstall the Java Runtime Environment (JRE) from your system, use the Add/Remove Programs utility in the Microsoft Windows Control Panel.

Click Start
Select Settings
Select Control Panel. Click Switch to Classic View
Double click the Add/Remove Programs control panel icon
The Add/Remove control panel displays a list of software on your system, including any Java software products that are on your computer. Select the Java Runtime Environment that you want to uninstall by clicking on it, and then click the Remove button.

Reboot your PC once all Java components have been removed
Proceed with reinstalling most stable Java version from here:

DOWNLOAD:
FOR WINDOWS: http://www.java.com/en/download/manual.jsp

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