Client Tools :: How To Insert Data From SQL To Oracle Server

I have problem: I have 1 sql server already setup SQL Server 2012 Express and 1 Oracle Database server 10g. Now i want to insert data from SQL server to Oracle database through link server.

Some step i already make:
1. Setup oracle database 10g and configure listener (Finished)
2. Setup Sql server 2012 express on Windows 7 (Finished)
3. Setup ODTwithODAC1020221 on PC already setup SQL server (Finished)
4. Make Linkserver from SQL server to Oracle database (Finished), and can select data from Oracle Database on SQL server through Linkserver.

However when i insert data from SQl server to Oracle Server not success.

select * from OPENQUERY (QVHKTEST, 'SELECT * FROM QVSYSTEM')

After i run above script, result is OK
With: "QVHKTEST" is alias of Link server from SQL to Oracle server
: "QVSYSTEM" is a table on Oracle database, that table we want to get through Linkserver on SQL server

Both Server Database contain same name table is "QVSYSTEM"
-----------
INSERT OPENQUERY (QVHKTEST, 'SELECT BODY_NO,
MERCHANDISE,
MODEL_NAME,
LINE_NAME,
DATE_ENTRY
FROM QVSYSTEM')
values('VNF4619829','3227B002CA','L1068','01','2012/09/26 03:18:11');

If i run script above directly in SQL Window query can insert OK. This is code in trigger at table on SQL server:

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:<Author Name: Phuong Do Minh >
-- Create date: <Create Date: 10/12/2012>
-- Description:<Description: After data insert into table qvsystem on SQL server
-- This trigger will fire and insert that data into table qvsystem
[code].......

But when i make trigger after insert on table in SQL Server to insert data From SQL server to Oracle server, however not success and SQL server raise error below:

OLE DB provider "OraOLEDB.Oracle" for linked server "QVHKTEST" returned message "New transaction cannot enlist in the specified transaction coordinator. ".
Msg 7391, Level 16, State 2, Procedure Insert_data, Line 16

The operation could not be performed because OLE DB provider "OraOLEDB.Oracle" for linked server "QVHKTEST" was unable to begin a distributed transaction.

I don't know how to configure them.