多项选择题
A. Hard drive and network activity is higher when the computer is idle
B. CD-ROM ejects unexpectedly from the computer
C. Web browser accesses unexpected websites
D. Prints from the computer have random characters and symbols instead of text
E. The monitor has a permanent image burned into the display
单项选择题 Malware has been detected and removed on a customer computer several times in a short periodof time. Which of the following will BEST help prevent future occurrences?（）
单项选择题 Which of the following is the default location for the User profiles folder in Windows 7?（）
单项选择题 Which of the following should the technician do FIRST when replacing a motherboard?（）