COM Interoperability Exception

Hi all,

I developed an application that uses Microsoft.Office.Interop.Word Version 11.0.0.0 .
I developed this appliaction on VS2005 on 32 bit machine.An d it works fine on local server
Then i uploaded this application on Server which have 64 bit machine an IIS7. On this sever the MS Office 2003 has installed.
When i m trying to access the application the there is Exception came
" System.Runtime.InteropServices.COMException (0x80040154): Retrieving the COM class factory for component with CLSID {000209FF-0000-0000-C000-000000000046} failed due to the following error: 80040154. "  

Please give me solution of this problem. I m suffering from this exception since last 2 weaks.
Thanks in Advance.