A Windows user reported that a pop$-$up indicated a security issue. During inspection, an antivirus system identified malware from a recent download, but it was unable to remove the malware. Which of the following actions would be BEST to remove the malware while also preserving the user's files?

A$.$ Run the virus scanner in an administrative mode.

B$.$ Reinstall the operating system.

C$.$ Reboot the system in safe mode and rescan.

D$.$ Manually delete the infected files.