A home user reports the PC is running slow, and pop-up advertisements are appearing on screen. The user can access the Internet and performs an antivirus scan. A technician is now troubleshooting the problem and cannot update the antivirus to the latest definitions or navigate to the vendor’s support website. Which of the following is the BEST next step to resolve this issue?
A. Uninstall the antivirus program and apply operating system patches
B. Utilize a different antivirus program and scan method
C. Format and reinstall
D. Reinstall the antivirus program from a shared executable