You have a computer that runs Windows Vista. You upgrade the network adapter driver on the computer. After the upgrade, you can no longer access network resources. You open Device Manager and see a warning symbol next to the network adapter. You need to restore access to network resources. What should you do?（） 
- A、A
- B、B
- C、C
- D、D
正确答案:A
答案解析:有
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