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How do I install Firefox with Windows 7?

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I have Windows 7 and after I downloaded Firefox to my computer and tried to install it a message pops up asking me to log in as administrator or my user name. Since I am the administrator and never set up a password, I try to log in with my user name. Logging in with my user name and password won't work, so I try with the administrator and since I don't know the password, of course that fails also.

I have Windows 7 and after I downloaded Firefox to my computer and tried to install it a message pops up asking me to log in as administrator or my user name. Since I am the administrator and never set up a password, I try to log in with my user name. Logging in with my user name and password won't work, so I try with the administrator and since I don't know the password, of course that fails also.

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Installing Firefox on Windows

https://support.mozilla.com/en-US/kb/Installing%20Firefox%20on%20Windows

Check and tell if its working.