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Can't download firefox, why?

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I currently have Internet Explorer and want my browser to be Firefox, mainly because the platform for my school runs better with Firefox. I went to the Mozilla website and clicked download latest verson. The run, save, cancel screen came up and I clicked run. After the download was complete a screen popped up saying that I do not have permission to run Firefox and that I can choose to continue on and use the current user or choose a new user which is Administrator and then a password box. When I choose current user nothing happens and I have no clue what the Administrator thing is. I've downloaded Firefox in the past to other computers but not to my current one which is a Dell laptop with Windows Vista.

I currently have Internet Explorer and want my browser to be Firefox, mainly because the platform for my school runs better with Firefox. I went to the Mozilla website and clicked download latest verson. The run, save, cancel screen came up and I clicked run. After the download was complete a screen popped up saying that I do not have permission to run Firefox and that I can choose to continue on and use the current user or choose a new user which is Administrator and then a password box. When I choose current user nothing happens and I have no clue what the Administrator thing is. I've downloaded Firefox in the past to other computers but not to my current one which is a Dell laptop with Windows Vista.