Starting a windows service as a "normal" user

I have the problem to allow a normal user the start/stop of a service of our own.

Here you've to start the Microsoft Management Console with  mmc.
Select Add Snap-In and in the dialog select Add and select Security templates.

The names may not be exact, because I've a German version of windows xp here.

Open the templates tree and double click the entry compatws on the right side.
Select System Services with double click and select your service.
Here you can add the user and select the allowed operations.

After this, you have to define a security database and import the configuration.

The helpful link in German  is here.