Cant Download Firefox because it has no valid digital signature

When I try to download firefox 4.0 I can either run or save the setup file, when I "Run" I get an error message saying I cannot download because the creator (FireFox) has no valid digital signature, when I download the setup file to my desktop and try to run from there I get the error telling me the file is Corrupt?

ok no problem so what i did was i went to the cmd prompt and typed in ipconfig( to get there on vista type cmd in the search in the start window then press enter, in xp type cmd in the run box.) when you press enter you will then need to scroll down and check out what your ip address is. proper ip addresses end in something like ...1.1 or 0.1 if it has any other number then that you need to reset your ip address in your network settings which can be accesed in control panel. and if you have the option click the box that says get ip address automatically. hope that works!

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