Your Windows 7 system may be missing a required root certificate (MicrosoftRootCertificateAuthority2011.cer) needed to verify the digital signature of the .NET Framework installer. This often happens on systems that are not fully updated.
Download the file once onto a USB drive and update multiple computers. Your Windows 7 system may be missing a
If the above link redirects or fails, navigate manually: Your Windows 7 system may be missing a