Link an Oracle DB to SQL Server

I am having trouble trying to link an Oracle DB to my SQL Server. I get this error:
"cannot create an instance of"
I created a DSN that connects to it just fine, but when I make the connection in SQL Server I keep getting this error. Any help is appreciated. I'm using SQL Server 2008 R2 and Oracle 11g.
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
>cannot create an instance of
means normally that the oraoledb is not properly installed, or is not configured yet with the oracle home ...  or you have a 32bit vs 64bit mismatch ...
dodgerfanAuthor Commented:
What can you do for the 32bit v. 64 bit mismatch?
Guy Hengel [angelIII / a3]Billing EngineerCommented:
you will have to make sure that the sql server installation "bit version" is the same as the oracle client "bit version".

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dodgerfanAuthor Commented:
I verified that they are both 64 bit. I ensured Oracle home is configured. I am getting this error now:
"[Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified".
The ODBC connection is set up and connects when I test it. Once i create the linked server, I get this error when I test the connection. Am I missing something else?
Guy Hengel [angelIII / a3]Billing EngineerCommented:
can you show how exactly you configured the linked server?
dodgerfanAuthor Commented:
I used the sp_addlinkedserver procedure.
EXEC sp_addlinkedserver  

The this:
EXEC sp_addlinkedsrvlogin
@rmtsrvname=  'DevServ' ,
 @useself= 'FALSE',
 @locallogin=  NULL',
 @rmtuser=   'DBUser' ,
 @rmtpassword=   'Test' ;

It creates it, then when you test you get the error.
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Microsoft SQL Server 2008

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