Virtual box shows error on Microsoft Windows Server 2003

Hi,
I downloaded Virtual Box 2.0.6 and installed on Microsoft Windows Server 2003 but I got the following error message at the end of installation during program launch. I uninstalled the program and reinstalled it but the same error displayed on the screen. How can I fix it? Have any idea?
Thanks for any help.

Error: Failed to create the VirtualBox COM object.
The application will now terminate
Callee RC: Co_E_SERVER_EXEC_FAILURE (0x800800005)
