If you did not set the ..
'Agent XPs' component is turned off as part of the security configuration for this server. A system administrator can enable the use of 'Agent XPs' by using sp_configure. For more information about enabling 'Agent XPs' see "Surface Area Configuration" in SQL Server Books Online. (Object Explorer)
- if using GUI open services, locate SQL Server Agent, double click and set startup type to automatic then click start.
- if you prefer to use command line you can just do the following on the master database:
EXEC sp_configure 'show advanced', 1;
EXEC sp_configure 'allow updates', 0;
EXEC sp_configure 'Agent XPs', 1;