Scheduled Task Problem

I have setup a Scheduled task to run a php script "Program Files\Internet Explorer\iexplore " http:\\scriptlocation\script.php?task=1. This is set to stop if it runs longer than 10 minutes. (This has been adjusted on the xml file as the options on the dropdown start at 1 hour) Also force to stop is checked.

The script runs OK but the task will not stop and shutdown explorer.

Any ideas I am not getting anywhere.

Thanks
Matt