今天给一个同事杀毒,杀到后面倒是干净了,可惜居然不能上网,初步断定是DNS解析失败,运行CMD,输入nslookup,出现如下信息:
C:\Documents and Settings\Administrator>nslookup
*** Can't find server name for address 202.96.209.6: No response from server
*** Can't find server name for address 202.96.209.133: No response from server
*** Default servers are not available
Default Server:  UnKnown
Address:  202.96.209.6
而在我自己的电脑上运行时却能正确解析:
C:\Documents and Settings\Administrator>nslookup
Default Server:  ns-pxb.online.sh.cn
Address:  202.96.209.6
是不是有某个系统文件被我删除了?谢谢!

卡卡社区真不咋地,不管是在反病毒区还是在这里,问的问题基本都没有人回答的了,我还是自问自答好了,先卸载tcp/ip协议,重启然后重新安装就好了,估计是我杀毒的时候把注册表内容损坏.