Welcome to this thread, @ritzypooh. I understand what you've been through, and I'm here to help you get past this error so you can get access to Quickbooks again.
To fix your Internet Explorer browser issue, you'll need to repair and reinstall the program. Also, please ensure you meet the browser requirements. At this time, QuickBooks Desktop 2021 requires internet access and Internet Explorer 11 (32-bit).
You can check out this article to learn more about theSystem requirements for the best experience in QuickBooks Desktop 2021.
Feel free to message again if there's anything else I can do to help. I'm here to lend a hand. Take care.
