Vista - Task scheduler problem : task do not close

I've set-up a task to start an internet radio each morning. It starts but it
doesn't close. Here's the XML listing. Thanks for any help !

<?xml version="1.0" encoding="UTF-16" ?>
- <Task version="1.2"
xmlns="http://schemas.microsoft.com/windows/2004/02/mit/task">
- <RegistrationInfo>
<Date>2007-06-06T20:57:52.0580578</Date>
<Author>ServeurJackEric\Jack-Éric</Author>
</RegistrationInfo>
- <Triggers>
- <CalendarTrigger id="977d0e2e-8879-4fdd-83b8-3fdf02afbf9b">
<StartBoundary>2007-06-05T06:45:00</StartBoundary>
<Enabled>true</Enabled>
- <ScheduleByWeek>
+ <DaysOfWeek>
<Monday />
<Tuesday />
<Wednesday />
<Thursday />
<Friday />
</DaysOfWeek>
<WeeksInterval>1</WeeksInterval>
</ScheduleByWeek>
</CalendarTrigger>
</Triggers>
- <Principals>
- <Principal id="Author">
<UserId>ServeurJackEric\Jack-Éric</UserId>
<LogonType>InteractiveToken</LogonType>
<RunLevel>HighestAvailable</RunLevel>
</Principal>
</Principals>
- <Settings>
- <IdleSettings>
<Duration>PT10M</Duration>
<WaitTimeout>PT1H</WaitTimeout>
<StopOnIdleEnd>true</StopOnIdleEnd>
<RestartOnIdle>false</RestartOnIdle>
</IdleSettings>
<MultipleInstancesPolicy>StopExisting</MultipleInstancesPolicy>
<DisallowStartIfOnBatteries>true</DisallowStartIfOnBatteries>
<StopIfGoingOnBatteries>true</StopIfGoingOnBatteries>
<AllowHardTerminate>true</AllowHardTerminate>
<StartWhenAvailable>false</StartWhenAvailable>
<RunOnlyIfNetworkAvailable>true</RunOnlyIfNetworkAvailable>
<NetworkSettings />
<AllowStartOnDemand>true</AllowStartOnDemand>
<Enabled>true</Enabled>
<Hidden>false</Hidden>
<RunOnlyIfIdle>false</RunOnlyIfIdle>
<WakeToRun>false</WakeToRun>
<ExecutionTimeLimit>PT2H</ExecutionTimeLimit>
<Priority>7</Priority>
</Settings>
- <Actions Context="Author">
- <Exec>
<Command>"C:\Program Files\Internet Explorer\iexplore.exe"</Command>
<Arguments>"http://www.radio-canada.ca/util/zapmedia/version10/frame.asp?menuFlash=6&directLink=http://www.radio-canada.ca/util/endirect/premiere.asx&promo=&duree="</Arguments>
</Exec>
</Actions>
</Task>