使用WPF管理工具的Windows服务

i'm trying to create a windows service with C# in .net that runs before the user is logged on... then when a user is logged on a symbol should appear in the system tray (next to the clock) to show the user that the service is running.. by double clicking that symbol a configuration utility (written in wpf) should be shown to the user, so he can configure the service, read data from it and so on .. i'm trying to create a windows service with C#