When you start a Windows Vista-based computer, you receive the following Windows Defender warning message in the notification area at the far right of the taskbar:

Windows has blocked some startup programs.

Windows blocks programs that require permission to run when Windows starts. Click to view blocked programs.
Note: You can see a list of blocked programs and services by following these steps:

1. Click the Blocked startup programs icon that is in the notification area.
2. Point to the Run blocked program menu list. The programs and services that have been blocked from starting are located here.