You are the network administrator for ExamSheet. You install a 16-bit ISA sound card on your Windows 2000 Professional computer. You have an unsigned device driver from the manufacturer of the sound card on a floppy disk. You install the device driver for the sound card. You restart the computer. During the startup process, the computer stops loading Windows 2000 Professional. You restart the computer and again the computer stops loading Windows 2000 Professional. You start the computer in safe mode. You want your computer to start properly. What should you do next? （）

A. Configure driver signing to prevent the installation of unsigned files.
B. On Control Panel selectSounds and Multimedia Devicesto remove the sound card drivers.
C. Use Device Manager to disable the sound card device.
D. UseSigverif.exeto find and delete all unsigned files.