SQL安装问题

书上说:在完成安装SQL Server 2005之后，PC的系统服务中将创建“SQL Server Browser”，“SQL Server (MSSQLSERVER)”，“SQL Server Agent (MSSQLSERVER)”，“SQL Server Active Directory Helper”，“SQL Server Analysis Services (MSSQLSERVER)”，“SQL Server FullText Search (MSSQLSERVER)”，“SQL Server Integration Services(MSSQLSERVER)”，“SQL Server Reporting Services (MSSQLSERVER)”和“SQL Server VSS编写器”服务。具体创建哪些服务，与用户选择安装的组件相关。为什么我装上去什么都没有？