Steam Download cannot install?

When I try to download + install Steam, a message comes up when I run the program that says, "The installation package cannot be opened.Verify that the package exists and that you can access it" We definately downloaded the correct version, Operating system Windows Vista, already tried... show more When I try to download + install Steam, a message comes up when I run the program that says,
"The installation package cannot be opened.Verify that the package exists and that you can access it"

We definately downloaded the correct version, Operating system Windows Vista, already tried uninstalling/reinstalling. Any help appreciated.
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