It's advised to uninstall the old java first before installing the new version. Or you can do this.
Please download JavaRa to your desktop and unzip it to its own folder
Run JavaRa.exe, pick the language of your choice and click Select. Then click Remove Older Versions.
Accept any prompts.
Open JavaRa.exe again and select Search For Updates.
Select Update Using Sun Java's Website then click Search and click on the Open Webpage button. Download and install the latest Java Runtime Environment (JRE) version for your computer.