>I downloaded the Datepicker.vcx class and added it to my application. When I send my .exe to my client, he gets 'Class not registered' when attemping to click the dropdown. It works fine on my XP Pro machine. He is running Server 2000. Any ideas on why this is happening or how to fix it?

When you add ActiveX controls to your application directly or using third-party libraries, you've to distribute coresponded OCX. In case of MS DateTimePicker it would be MSCOMCt2.ocx. Also, the OCX has to be registered on the destination PC.