A. The default behavior of an ActiveX control is to start in a browser, so you must uninstall Internet Explorer from your system

B. The startup project hasn't been set. Right-click the ActiveX Control project in the Project window and select Set as Start Up

C. The startup project hasn't been set. Right-click the standard EXE project in the Project window and select Set as Start Up

D. The control won't run in a form until it's compiled. The ActiveX control must be compiled first by select the Make item from the File menu