单项选择题 You need to back up the existing data on a computer before you install a new application. You also need to ensure that you are able to recover individual user files that are replaced or deleted during the installation. What should you do?（）

单项选择题 You have a computer that runs Windows Vista. You need to collect performance data on your computer for a period of four weeks. The performance data must include CPU utilization, memory utilization, and disk utilization. What should you do?（）

单项选择题 You share a computer with other users. You need to ensure that all application and device driver failure reports for this computer are submitted to Microsoft Problem Reports and Solutions. What should you do?（）