New Post: TaskCreation.CreateOrUpdate does not work on XP

I am facing a problem while editing tasks on a XP machine.

While editing a task, i register it using the flag TaskCreation.CreateOrUpdate but after the update find that always a new task gets created (because after updating the task the last run time of the task is displayed as 'Never' in windows task scheduler.)

This flag works properly on Vista and Windows 7.

Any help would be appreciated.

Thanks.