Run time error on one machine.

Question

Hi I am not really clued up on C#, i have some sample code which uses an API to read a data source. One machine has VS2003 and one machine has VS2003 and VS2005. My application is created in VS2003. When I build my project I don't get any errors. When I run it I get a nasty error on the machine with both versions of VS installed on it. Can anyone explain why I get this message? Unhandled Exception: System.Runtime.InteropServices.COMException (0x80040154): COM object with CLSID {2B7D706A-E6F0-11D2-834A-00105AA72C88} is either not valid or not registered. Like i said I only get it on the machine with two versions of Visual Studio.