Communication with the underlying transaction manager failed

My setting is
"Component Services"->"Computers"->"My Computer"->"Distibuted Transaction
Controller"->"Local DTC"-> "Security-tab" in "Local DTC Properties":
Network DTC Access checked.
Allow Remote Clients checked.
Allow remote Administretion checked.
Allow Inbound checked.
Allow Outbound checked.
No Authentication Required
Enable XA Transaction

and i used window xp visual studio 2008 and sql server 2005

i do every thing but error is same

Arvind Tomar