First, uninstall ALL older versions of java. Since you are on Windows, this tool should work. Run it AFTER closing EVERYTHING ELSE out. Go into your system tray at the bottom right, and right-click and "quit" anything you many have there (including the ones hidden (<) ), as they most likely are unnecessary. Okay?
Try and run this (not tested, but should work):
www.java.com/en/download/uninstallapplet.jsp
THEN take the offline installer, run it as admin (if it doesn't prompt for permission automatically), and proceed to install java. Make sure nothing else is open!
Got that? Okay. Did it work? Okay, try and run the launcher. Did it NOT work? THEN... Press the "print screen" (prtscn) key on your keyboard, immediately open up Paint, and paste (Ctrl-V). Save the image, and attach it by clicking "Reply" (not quick reply!) and "Add file", right under your message box.
Manual install would be super prone to error, and would not be automatically updated.
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