You can download the latest Java 7 from here
. Click the JRE Download button for Java SE 7u4, not JDK. You don't need to uninstall Java 6. Installation instructions here
Running the Installer
Note: You must have administrative permissions in order to install the JRE.
If you saved the JRE installer to your computer, run the installer by double-clicking it. Follow the instructions the installer provides. When you are finished with the installation, you can delete the downloaded file to recover disk space.
The installer may ask you to reboot your computer if you chose not to restart an internet browser when it prompted you to do so.