>I have a customer who is using an old foxpro application from a customer not in business. He has started getting an error "class not registered" when he tries to run it. It looks like he is probably missing an activex or ole control. What is the best way to go about figuring out which control is missing? I know nothing about the app yet, I have just received an e-mail indicating the error he is receiving.

I would start by getting whole error message from customer.