Problem with service of the SQL server 2005

Hello, I have a problem: I accede to the SQL server 2005 having installed the SQL server locally but it does not allow me to initiate, to stop nor to reinitiate the service, that only happens to my user, however with another one if it allows. the network is with work group, that podria to be? thanks for its attentionYou need to log in to your computer as a member of the Windows Administrators group to start or stop the SQL Server service. When you are logged in as an administrator, you can use the SQL Server Configuration Manager tool to start and stop the service or change service startup properties.