Task Sheduler doesnot permit to create task with no user login

Dear Friends ..


I am using windows vista 32 bit enterprise edition. I need to configure
a scheduled task even if no user is logged in. I tried to make a task
but when i select "Run whether user is logged on or not", it asked to
input the Computername\username and password. I logged in as local
administrator and i have keyed in the samew credentials. But i am
getting an error message at this screen saying "A specified logon
session doesnot exist. It may already have been terminated." I have no
issues for setting up a shedules task that run under the local
administrator login if the administrator is logged in. But i need to run
the task even if no body logon to the computer. Can any one help me ???

FYI: I am using SyncToy for folder synchronozation and i am looking
foward to schedule it to run every night..

Thanks in advance
Rajesh


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kbrajesh