As of September 1st 2015, Chrome no longer supports the NPAPI plugin.Java's FAQ for more information.
Before enabling Chrome's Java plugin, make sure you have already installed Java onto your machine: Windows - Installing Java
- Start Google Chrome and in your URL bar navigate to: chrome://flags/#enable-npapi
Once on the configuration page click the Enable link located in the NPAPI configuration section.
- Once you've enabled NPAPI go ahead and restart Chrome