Windows Application Lock with Custom Error Message

I'm seeking a developer to implement a security feature in my Windows application. ( windows 7 )
The app should lock and display a customized error message when credentials expire. This message should contain text and a link to support.

Key Requirements:
- Implement a locking mechanism that activates upon credential expiration.
- Design a customized error message that is displayed upon locking.
- The error message should be able to display text and a hyperlink to support.
- must be able to only unlock by a file or hidden credentials

Ideal Skills:
- Experience in Windows application development.
- Understanding of security features implementation.
- Proficiency in UI/UX design for error messages.

Please provide examples of similar projects you've completed in your bid.

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