If you want to enable "Allow service to interact with desktop" for schedule taks service.
Start --> Run --> type services.msc --> select Task Scheduler --> right click --> select properties --> Logon Tab --> Select Local system account and select "Allow service to interact with desktop".
yea...sorry..I could have made my question little more elaborative.....Those options are like faded and am not able to change it...How to enable it back ?
The Microsoft Server topic includes all of the legacy versions of the operating system, including the Windows NT 3.1, NT 3.5, NT 4.0 and Windows 2000 and Windows Home Server versions.
Select the service --> right click --> properties --> Logon Tab --> Select "Allow service to interact with desktop"
This option is not avaibale on schedule task.