I've been all over the internet tearing my hair out trying to figure this out and I finally resorted to making an adobe account. So I'm running Windows 8.1 and the latest version of Mozilla. When I download the flash installer to install the latest version of flash player, it downloads just fine. I then double click it and run it and say yes to allow it to make changes to my computer. Then... nothing. Absolutely nothing happens. If I try to click the installer again it says only one instance of it can run at a time and I have to go into task manager to kill it. But even if I do that an run the installer again still nothing happens. Why won't flash player install? This is driving me crazy. I tried deleting everything for a clean install and now I just don't have flash player and can't get it to work still. Please help.