how to start/run a windows service at particular time (say: 12:00 PM) every day?

Background: I have developed a windows service which runs once every day and does the work (every thing is just right!)

Issue: the service runs exactly at the same time (last run time) the other day.. Ex: If I start the service at 4:00 PM today so it will run again at 4:00 PM every day.

My solution till yet (but not working fine) I want it to configure it self with the StartTime and IntervalTime mentioned in the app.config file and run at that time everyday (regardless of when I have started it)

Having problems with this silly thing .. Please help in this regards with sample code. Your help is really appreciated, Thanks in advance.

For further clarification, if I have mentioned in app.config

key="StartTime" value="12:00"
key="Interval" value="86400000"

so it must run on 12:00 PM every day (as interval period is 86400000 milliseconds i.e. 1day) regardless of the time when I started it or make it live.

You could set up a scheduled task that starts the service at a specific time and stops it at another via a batch file. You would utilize the commands net stop myservice and net start myservice in the batch file.