Windows Defender is the only antivirus software allowed to be used with the IHT Software.  All other antivirus programs will interfere and cause operating issues with the IHT Software and will void any warranty with IHT. Windows Defender is a part of the OS package of Win 10 and Win 11 and can be easily activated at no further charge.  IHT is happy to help you with this install if required.  To activate Windows Defender, all other antivirus must be uninstalled.