"Cannot create an instance of OLE DB provider" error as Windows Authentication user

I am trying to run openrowset from MS SQL Server on an Oracle server.

When i execute the following command:

select * from
OPENROWSET('OraOLEDB.Oracle','srv';'user';'pass', 
'select * from table')

the following error occurs

Msg 7302, Level 16, State 1, Line 1
Cannot create an instance of OLE DB provider "OraOLEDB.Oracle" for linked server "(null)".

Can anyone tell me how I can use openrowset with OraOLEDB.Oracle?

I am using 64 bit version of MS SQL Server and Oracle OLEDB driver.

Edit

I have tried this on two machines running Windows 7 x64 & Windows Server 2008 x64 with MS SQL Server 2008 x64. Both showed the same error message.