If the error persists, the control may depend on other files (like msvbvm60.dll ) that are also missing. Unregistering:

Launch your legacy application as (right-click → Run as administrator). The error should no longer appear.

If you are an IT technician supporting legacy manufacturing equipment, a hobbyist trying to run an old engineering simulation, or a business owner attempting to migrate an older ERP system to Windows 10 or 11, you have likely encountered the dreaded fast2001.ocx error message.