After pulling my hair out trying to install Firefox 4 on Windows 7, I found a solution to the installer disappearing after extracting files. Right-click on the installer and choose Run as administrator. This is not the same, apparently, as selecting the administrator account in the pop up dialog or choosing your account if it happens to be an administrator account, which mine is. Nope, Run as administrator it must be.
Firefox 4 on Windows 7 Installation Madness
March 25, 2011 by Gary Gregory
Bah. Firefox 4 is nothing compared to the speed of Chrome. I thought the new release would mean I could go back to Firefox because they’d speed it up. They haven’t