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error 1721 there is a problem with this windows installer package

How To Fix Installer Error 1721

  • Restart your PC and just after the BIOS message, press F8
  • Now, there should be a list of options. Use the arrow keys to navigate to Safe Mode.
  • Log in as an admin


  • Click Start > Run > Type “cmd” and press enter.
  • When the command prompt opens, type “msiexec u/unregister” and press enter.
  • In the command prompt again, type “msiexec /register


  • Type exit to quit command prompt, or click the X in the top right.
  • Click Start > Control Panel
  • Click on “Add/Remove Programs
  • Locate the program you wish to uninstall and attempt to do so

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