Is this about installing Firefox? Download and save the Firefox installer to the desktop and start the installation with a double-click on the desktop icon. You can find the full version of the latest Firefox 25.0.1 release in all languages and for all Operating Systems here: *http://www.mozilla.org/en-US/firefox/all.html ---- Try to boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as to see if that helps.