Final answer:
When all user files are set to system and hidden, the technician should use the attrib command in the command prompt to change the attributes of the files back to their original settings.
Step-by-step explanation:
When all user files are set to system and hidden, the technician should not ignore the hidden files. Instead, the technician should use the attrib command in the command prompt to change the attributes of the files back to their original settings. The command attrib -s -h -r followed by the file path will remove the system, hidden, and read-only attributes from the files.
By using this command, the technician can regain access to the user files. However, it is important to first identify and remove the virus or malware that caused the files to be set as system and hidden. This can be done by running a reputable antivirus or antimalware software to scan and remove any infections. Ignoring the hidden files or reinstalling the operating system or deleting all user files are not necessary steps.
In this situation, reinstalling the operating system or deleting all user files are not necessary steps. Reinstalling the operating system would be a last resort if all other attempts to remove the virus or malware fail, and deleting all user files would result in permanent loss of important data.