To ensure that the computer is running no problem, or it is best to install the Trend Micro, the most common security software can protect your computer from harm. I did not understand these security measures, the final Na Quxiu computers are not fixed, because the system has been broken, and finally re-do it again the system, the original documents are gone. Later that have been installed Trend Micro security software, and now what the problem did not appear, he is now my classmates and old computer some minor problems, although he did not care, some small problems did not affect anything, but I still think the most good safety measures, install a Trend Micro security software is not a difficult task.