A user contacts a PC technician and states that their computer is not functioning properly. The technician logs into the PC and tries to run the antivirus application on the PC, but gets an access denied error. The technician also tries to run a System Restore and gets the same error. Which of the following steps should the technician perform?

A.
Boot into safe mode and run antivirus software.

B.
Replace the PC hard drive then rerun antivirus application.

C.
Reformat the hard drive and reinstall the operating system.

D.
Install a new antivirus application, perform all updates, then run software.