You have a computer that runs Windows Vista Ultimate.
You open the Windows System Performance Rating tool and receive a Windows Experience Index base score of 1.0. The subscores are as follows:
·Processor: 4.7
·Memory (RAM): 3.6
·Graphics: 1.0
·Gaming Graphics: 1.0
·Primary Hard Disk: 3.0
You upgrade your video adapter card with a new card that meets the minimum requirements for Windows Aero.
You open the System Performance and Rating tool and notice the base score and subscores have not changed.
You need to enable Windows Aero.
What should you do?（）

A.A
B.B
C.C
D.D