Hello Colby,
Good day! I'm John Dev a Windows user like you and I'll be happy to assist you today. I know this has been difficult for you, Rest assured, I'm going to do my best to help you.
Have you tried removing the computer from the domain before installing the .net 3.5 framework? Please try disabling or uninstalling your Antivirus then try installing again.
Kind regards,
John DeV
Independent Advisor