I had uninstalled Java on my PC (Windows XP/SP3) because of constant problems with the plug-in container (slowness, crashing, etc.). But then I found I could not log in to an online learning platform that I needed for work without it. So I went to java.com and downloaded all three of the installers that Java recommended for my OS. These were installers for 8u101. I tried each of them, and each time I got a popup reading "Warning - Java Installer: Java 8 requires a newer version of Windows. You may continue with the installation, but in order for Java to work as intended, we recommend that you upgrade your operating system". I clicked OK, but nothing happened. When I double-clicked again on the installer, I got "Another Java installation is in progress. You must complete that installation before you can run this installer." While attempting the downloads, I closed my browser and temporarily disabled my security software. I even clicked on "Properties" and then on Advanced for each installer, and checked the box labeled Unblock, but none of these steps seem to work.