A user has discovered that even though they are using the latest version of the anti-virus software,the computer is still being infected by a virus. Which of the following is the BEST solution for this problem?（）

Operating system files for Windows Vista and Windows XP...

多项选择题Operating system files for Windows Vista and Windows XP are located in which of the following?（）(Select TWO).

A user reports the system runs fine for a few minutes a...

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?（）

A user reports their system is displaying an error mess...

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?（）