You install Microsoft Windows Vista on a new computer. The computer has the following hardware configuration: 2.4-GHz processor 2 GB of RAM 512-MB video adapter 250-GB hard disk. You are unable to view the following features of Windows Vista: Thumbnails Previews on folders Transparent glass. You need to be able to view the advanced visual features of Windows Vista. What should you do?（）

• A、A
• B、B
• C、C
• D、D