Internet explorer 5 updating
Confirm your selection on the "Download Checklist" web page.
Click "Yes" in the "License Agreement" window that appears. A gray panel entitled "Microsoft Windows Update" will appear while the setup program is downloading to your hard drive. Once again, a white and blue "License Agreement" panel will appear.
(At the time of this writing, Internet Explorer 5.5 was the latest version). Close your browser and locate the newly saved file on your PC Desktop.
After the installation, I cleared Java Cache, browser's Cache, and logged into a secure website that uses an Applet to provide certain additional services to the user. I accessed to check the Java version detected in Internet Explorer, and the java website says: Other browsers can check Java, and the mentioned applet works as expected: As the applet works as expected in other browsers, I can assume the problem is not the Applet nor its deployment files/processes, but the compatibility of JRE 7u51 with IE 11.
So what for me fixed it, was to set IExplorer as the default browser again, uninstall Java, go to using the IExplorer, and from the IExplorer download and install Java again to the last version.