Windows cannot send administrative alerts unless the Alerter service is running. To start the Alerter now, click the Start ...

Windows cannot send administrative alerts unless the Alerter service is running.  To start the Alerter now, click the Start button, point to Programs, point to Administrative Tools, and then click Computer Management.  In the left pane, double-click System Tools, then click Services.  In the right pane, double-click Alerter.  Under Current Status, click Start.  To have the Alerter start automatically each time Windows starts, under Startup, click Automatic.