iTunes sdk gives COM Exception

Hi,
I am a dotnet developer and trying to use the itunes sdk available at the apple site to build my custom application to communicate with iTunes. I have successfully build that as a windows form application and is working fine. Now i have decided to build that application as a window service due to some requirements but the issue is the same code which is working in windows form application is giving me exception in window service. Kindly if any one can provide me any help or link to resolve this issue. Mentioned below the details of the error that comes on window service application in dotnet.

On this line of code its giving me the error.

Code:
iTunesLib.iTunesApp objiTunes = new iTunesAppClass ();

Error:
Retrieving the COM class factory for component with CLSID {DC0C2640-1415-4644-875C-6F4D769839BA} failed due to the following error: 80080005.


Thanks a lot in advance
Kashif