This error is usually caused by the SQL Server Database Engine being unable to read or access the specified physical file (including MDF files and LDF files). Operating system error 5 may be caused by incorrect permission settings or files being occupied by other processes. You can try the following to resolve this issue:
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Check file access permissions: Make sure the SQL Server Database Engine has permission to access the specified file. You can use Windows File Explorer or command-line tools to check and modify file access permissions.
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Check if the file is in use: In some cases, the file may already be in use by another process. You can use tools such as Process Explorer or Task Manager to see which processes are accessing the file.
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Restore Backup: If you took a backup during maintenance, you can use the Restore Backup feature to restore the SQL Server database files.
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Create a new database: If you have created a new database in the SQL Server database engine, then you can try to create a new database and export the tables and data from the original database to the new database.