Unable to install Firefox on windows

I previously downloaded firefox but uninstalled it due to malware problem. After fixing the malware problem with Malwarebytes, I re-downloaded the Firefox 18 setup file. When I click on it, it starts extracting and then a pop up window appears asking whether to install as administrator or as current user. When I say as current user nothing will happen. When i selected administrator, they prompted me for a password but I did not set any password for the administrator account in the first place.

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