.NET installation failed with error code 5100


You receive an error code of 5100 when attempting to install .NET on a target machine.


Error 5100 is a general error from the Microsoft .NET installer that can have a number of meanings:

  • .NET has already been installed and target computer needs to be rebooted.
  • The user running setup does not have administrative privileges (all installs are ran with admin privileges from PDQ)
  • A previous beta version is installed
  • A later version of the .NET Framework is already installed
  • The OS that setup is being run on is not supported
  • The OS that setup is being run on does not have the minimum service pack installed
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