单项选择题 A Windows XP system has been badly infected with malware. The technician notices that the malware is making repeated attempts to broadcast over the network from activity seen on the local firewall. Which of the following Windows XP startup options would be the SAFEST way to remove the malware?（）

单项选择题 Which of the following could be disabled to improve performance and response, in Windows Vista,on a computer with an older video card?（）

单项选择题 After POST, the error message ‘Invalid system disk. Replace and press any key’ appears. Which of the following is MOST likely the cause?（）