If you are encountering an error code 53003 when trying to log into Workday and you are not an employee of any organization, it is likely that you do not have access to the Workday system for that specific company. Since you mentioned that you are trying to withdraw your application from an XYZ company, you should contact their HR department or the person who interviewed you for assistance. They can provide guidance on how to formally withdraw your application.
As for the admin question, if you are using your personal laptop, you are the administrator of that device. There is no separate admin for personal laptops unless you have set up additional user accounts with administrative privileges. If you need help with your laptop itself, you might want to consult the support resources for your operating system (like Windows or macOS).
If you have further questions or need assistance with a specific issue regarding Microsoft products, feel free to ask!