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Op het scherm na op uitvoeren te klikken komt er een schermpje administrator waarbij ik een wachtwoord moet ingeven, maar het werkt niet. Hoe kan ik dit oplosse

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Ik kan het niet installeren :-'(

Ik kan het niet installeren :-'(

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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:


Try to boot the computer in Windows Safe Mode with network support (press F8 on the boot screen) as to see if that helps.