You are the network administrator for Company. Your computer is installed with Windows 2000 Professional. After installing a new application you restart the computer and receive the following error message: "NTLDR is missing - Press any key to restart." You want your computer to start properly. You want to do this with the least amount of administrative effort. What should you do?（）

A. Reinstall the operating system.
B. Start the computer by using the Windows 2000 Professional CD-RO
C. Start the recovery Console and select the option to verify system files.
D. Insert the Emergency Repair Disk.
E. Copy Ntdetect.com from the /i386 folder on the CD-ROM to the root folder on the boot partition.