antivirus not working

On unsupported systems, you may use one of the methods in this link to run setup. https://www.elevenforum.com/t/bypass-windows-11-system-requirements.1989/

The following disclaimer applies if Windows 11 is installed on a device that doesn't meet the minimum system requirements:

This PC doesn't meet the minimum system requirements for running Windows 11 - these requirements help ensure a more reliable and higher quality experience. Installing Windows 11 on this PC is not recommended and may result in compatibility issues. If you proceed with installing Windows 11, your PC will no longer be supported and won't be entitled to receive updates. Damages to your PC due to lack of compatibility aren't covered under the manufacturer warranty. By selecting Accept, you are acknowledging that you read and understand this statement.

Src: Installing Windows 11 on devices that don't meet minimum system requirements - Microsoft Support: https://support.microsoft.com/en-us/windows/installing-windows-11-on-devices-that-don-t-meet-minimum-system-requirements-0b2dc4a2-5933-4ad4-9c09-ef0a331518f1