You are the desktop administrator for your company. All client computers run Windows XP Professional. Currently, 10 of the computers in the graphics department contain two processors. You want to install a second processor in each of the remaining computers in the graphics department. You install a second processor in a test computer. When you start the computer, the start process begins normally and then terminates. You receive the following error message: "STOP: 0x00000079 HAL_MISMATCH." When you restart the computer, it stops again, and you receive the same error message. You remove the second processor, and the computer starts normally. When you attempt to install a second processor in a different test computer, the same STOP error occurs. You need to eliminate the error so that you can install the second processor on all of the computers. What should you do?（）

A. Before you install the second processor, install the multiprocessor HAL on each computer.
Before you install the second processor, configure the each computer's system BIOS for multiprocessor AP
C. After you install the second processor, restart each computer by using the Recovery console, and copy the multiprocessor HAL files from the Windows XP Professional CD-RO
D. After you install the second processor, start each computer in safe mode. Configure the SSDP Discovery Service startup parameter to Manual.