How to configure DCOM configuration for Export To Excel?

I am implementing Export To Excel functionality in one of my asp.net application. I have two servers(QA and Development). In Development server it works fine but in QA server i am getting below error.

    An exception of type System.Runtime.InteropServices.COMException occurred and was 
caught. Source:mscorlib;Message:Retrieving the COM class factory for component with CLSID 
{00024500-0000-0000-C000-000000000046} failed due to the following error: 8000401a The 
server process could not be started because the configured identity is incorrect.  Check the username and password. (Exception from HRESULT: 
0x8000401A).;Target:System.MarshalByRefObject AllocateUninitializedObject(System.RuntimeType);StackTrace:   at 
System.Runtime.Remoting.RemotingServices.AllocateUninitializedObject(RuntimeType objectType)     at 
System.Runtime.Remoting.Activation.ActivationServices.CreateInstance(RuntimeType serverType)     at 
System.Runtime.Remoting.Activation.ActivationServices.IsCurrentContextOK(RuntimeType serverType, Object[] props, Boolean bNewObj)     at 
System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandleInternal& ctor, Boolean& 
bNeedSecurityCheck)     at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean skipCheckThis, Boolean fillCache)     at 
System.RuntimeType.CreateInstanceDefaultCtor(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean skipCheckThis, Boolean fillCache)     at 
System.Activator.CreateInstance(Type type, Boolean nonPublic)     at System.Activator.CreateInstance(Type type)     at XXXXXXXXXXXXX  Method - XXXXXXXXXXXXX

I have configured same thing in both servers but still QA server not working properly. What should i do next? Any idea...??

Is Excel 2000 installed on your QA server ? At least it wasn't able to startup the automation...

Source: http://support.microsoft.com/kb/292491/en-us

Excel.Application version-independent PROGID and the {00024500-0000-0000-C000-000000000046} CLSID. COM related registry entries for Excel 2000 include the following: HKEY_CLASSES_ROOT\Excel.Application\CLSID Default Value: {00024500-0000-0000-C000-000000000046} HKEY_CLASSES_ROOT\CLSID{00024500-0000-0000-C000-000000000046}\LocalServer32

Default Value: C:\PROGRA~1\MICROS~1\Office\EXCEL.EXE /automation By following the registry keys from the PROGID to the CLSID, COM can learn where the Excel executable file is installed and start it for Automation.