MSTask.exe
(Microsoft)
The Windows Tasks Scheduler, also called the Scheduling Agent. Made active by default when you install Windows 98/ME it appears in the System Tray as a blue box with a red stopwatch in Windows 95/98 and shows up in the Task List. In Windows ME it is a hidden task visible only through the Processes list in Starter and there is no icon for it in the System Tray. There is also no icon in the System Tray in Windows NT4/2000/XP but you can see the task in Task Manager.
Recommendation :
If you do not have tasks that you want to run on a regular basis, or you simply want to de-activate the Task Scheduler, double-click on the icon in the System Tray and choose the "Advanced \ Stop Using Task Scheduler" menu option; then close it and Task Scheduler will no longer start automatically with Windows. If you wish to re-activate it, you will find it in "Start \ Programs \ Accessories \ System Tools" (open it and choose the "Start Using Task Scheduler" option).