If you're running Windows XP, check you list of running services by going to Start and Run, and typing services.msc. Check to see if you have the appropriate services running for what you need to do. Example: The RPC Service may not be able to start or a service associated with it...or a service may be disabled. That would block the Remote Procedure Call (or another service) your program is trying to utilize. Also, check the Event Viewer to see what services are failing to start properly....this should help narrow it down. If it's an app that requires a connection to the web, check your firewall also. Hope this helps....