How do I make a clean install of Java?

[Rage]

In some rare cases, it might be necessary to completely remove Java from your system and re-install it.

Windows
Access the control panel via the Start Menu.

Click into Programs & Features or Add/Remove Programs or Programs - depending on your OS - and select to uninstall programs.

Once the list of programs has loaded (may take a while), scroll down to find Java.
It will look something like this: Java(TM) 6 Update 23
You may have multiple Java versions installed.

Uninstall it, then go to the Java homepage to download the latest version.