单项选择题
A.From the Windows 7 installation media, run Rollback.exe.
B.From the Windows 7 installation media, run Migsetup.exe.
C.Start the computer from the Windows 7 installation media. From the Install Windows dialog box, select the Upgrade option.
D.Start the computer from the Windows 7 installation media. From the Install Windows dialog box, select the Custom (advanced) option.
单项选择题 You have a computer that runs Windows Vista. You install Windows 7 on a new partition on the computer.You need to ensure that the computer always starts Windows Vista by default. What should you do?（）
单项选择题 You need to reduce the amount of space currently being used to store system restore points. What shouldyou do?（）
单项选择题 You need to back up your Encrypting File System (EFS) certificate. You must achieve this goal in theminimum amount of time. What should you do?（）