This is Windows that tells you that the file or folder you are trying to delete is locked and still in use by the program, or possibly Windows itself.
Nke a bụ Windows na-agwa gị na faịlụ ma ọ bụ folda ị na-agbalị ka ihichapụ bụ ekpochi ma ka na-eji ya eme ihe, ma ọ bụ ma eleghị anya ọbụna Windows n'onwe ya.