"He who marches out of step hears another drum." ~ Ken Kesey
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Try this link:http://www.microsoft.com/en-us/download/details.aspx?id=17718That's a standalone installer, as in, it will download an exe file that you run.Sometimes the web installers can get funky.Reboot your computer before starting all this, many system files need a reboot before they 'take'.Perhaps net framework 4 is already in. Windows update should have already installed it for you before.
This may sound obvious, but are you logged in as a user with administrative permissions?