I installed my windows service via (name of the service: Testing Service)
InstallUtil.exe present in .NET Framework (:\\Windows\\Microsoft.NET\\Fram
InstallUtil only performs actions exposed by your .Net Installer classes, such as registering a service.
It does not perform the "standard" application installation which results in the entries being added into add/remove programs.
To do this, you will need to look at various install builders such as Wix, Installshield, etc.