Troubleshoot installing Windows Defender definitions updatesġ.
Windows Defender no longer wants to update.
However, it's also possible that you have never seen it since the installation of an anti-virus often tends to deactivate this anti-malware built into Windows 7 to prevent Windows Defender and your new anti-virus come into conflict. If you are still on Windows 7, you may have already noticed that there is an anti-malware named : Windows Defender.