Windows Defender March 2025 Update Download. Specifying the day of the. Open the windows defender security center by clicking the shield icon in the task bar or searching the start menu for defender.

Customers running windows server 2008 r2, or windows server 2008 need to purchase the extended security update to continue receiving security updates. The antimalware platform version of microsoft windows defender installed on the remote windows host is prior to 4.18.24010.12.