单项选择题
A. Replace the computer.
B. Run chkdsk /f.
C. Update the virus signatures.
D. Run scandisk.
多项选择题 Operating system files for Windows Vista and Windows XP are located in which of the following?（）(Select TWO).
单项选择题 A user reports the system runs fine for a few minutes and then freezes or locks up. Which of the following is the BEST cause of this issue?（）
单项选择题 A user reports their system is displaying an error message ‘NTLDR is missing’. Which of the following is the MOST likely cause for this error?（）