Windows scheduler task is running Continuously when i restart computer

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Win2003

C#

Windows

I have a C#.NET windows based application, which send mail to clients after 1 hours if the flag is TRUE in database. So i have developed a code to send email depend on the flag status.

For sending mail per hour, i have added my EXE to windws schedular and schedule it for 1 hour in repeat task settings

Now the problem is when i restart my machine Windows scheduler task is running Continuously
and my code get's stuck.

What should i do ? is there any property of schedular to work with ?

Thanks In advance