Error 12007 QuickBooks generally occurred due to mis configured system files, which results in registry issues. Also, the browser, antivirus, or firewall problem leads to QuickBooks error 12007. In order to fix the problem, you will need to resolve the internal QuickBooks desktop issues or internet errors. For that, firstly, you will need to update the operating system of your computer and the QuickBooks software to the latest version. Ensure that you are using a stable internet connection, and it should pass the internet literacy test. Additionally, ensure that Internet Explorer is chosen as a default browser. You may also try to rectify the SSL settings and reconfigure the system firewall so that it wouldn’t quarantine the QuickBooks files.