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 configur
a scheduled task even if no user is logged in. I tried to make a tas
but when i select "Run whether user is logged on or not", it asked t
input the Computername\username and password. I logged in as loca
administrator and i have keyed in the samew credentials. But i a
getting an error message at this screen saying "A specified logo
session doesnot exist. It may already have been terminated." I have n
issues for setting up a shedules task that run under the loca
administrator login if the administrator is logged in. But i need to ru
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 lookin
foward to schedule it to run every night.

Thanks in advance
Rajes

--
kbrajesh