If the Java (TM) Platform plugin for your installed Java version is not detected after updating to Java 7 Update 10 or above, this can be caused by a standalone installation of JavaFX that prevents the Java plugin from being properly registered. JavaFX used to be bundled with earlier versions of the Java 7 JRE (Java Runtime Environment) but is now included as part of the JRE.
To resolve, follow the instructions given here to get to the Windows Control Panel list of installed programs and uninstall JavaFX. (This java.com help page recommends uninstalling all Java versions, including JavaFX, and then reinstalling the latest version of Java.)
You will find manual uninstall instructions in this article.