I have a computer with Windows 8.1 installed. I thought that was the problem, but I've seen others write that they had no problem installing Forefox with 8.1. I've been trying to download Firefox from Chrome, and while I can manage to download just fine, installation will take for ever and then stop completely saying it has been interrupted. Avast! will then scan the file, say it's fine and ask if I want to try again, but a popup will appear saying that the file is corrupted and cannot be extracted. After several failed attempts, I tried from Internet Explorer, but with even less luck. Firefox wouldn't even download, and something called Windows Smartscreen kept popping up saying it had prevented the app from running. I would tell it to run anyway, but I'd only get another popup saying that this app could not be run on this computer.