I was having problems with Flash on Firefox so I decided to uninstall and reinstall Firefox. However, having downloaded the installer, when I try to run Firefox Setup.exe, after extraction, it asks me whether I want to run it as the current user or change users (the current user is an administrator) and whichever option I select, when I click Ok, the box disappears and nothing else happens. I have tried downloading the installer again, but it's the same, and I have also tried installing an older version of Firefox but exactly the same thing happens... I really hope someone can help! Thanks.