Virus definitions updating
2] Run the Windows Update Troubleshooter from Microsoft.
Check this Fix It to reset Windows Update components and this Fix It to repair Windows Update components.
4] Use a standalone anti-malware to scan your system for malware.
Sometimes malware can turn off updating of security software.
Some System Mechanic Pro users are experiencing difficulty downloading new virus definitions, the essential protective mechanism that keeps your PC safe from the very latest malware threats.
The inability—or only intermittent ability—to receive new virus definitions can stem from the settings in your broadband router.
After the file extraction dialog box closes, verify that the Windows Defender definitions have been updated.
This has been going on for some time now and I am not sure if its doing anything or what.
To address the issue you may try these troubleshooting steps : 1] Switch from Microsoft Update to using Windows Update.
If your Windows updates are all set, but you still want to check to make sure that you have the latest antivirus definitions, you can check for updates at any time.
The newer upgrade will not install on my computer The problem is that newer virus definitions will not download, and now I'm getting nagged by Windows Security Alerts.
In order to guarantee the continuing effectiveness of your antivirus software, it is imperative that your virus databases are updated as regularly as possible.