The connection to adb is down, and a severe error has occured.
You must restart adb and Eclipse. Please ensure that adb is correctly located at ....
解决方法：
（1）：打开CMD，进入：
>adt-bundle-windows-x86-20131030sdkplatform-tools>adb.exe kill-server
提示：* server not running *
>adt-bundle-windows-x86-20131030sdkplatform-tools>adb.exe start-serfver
提示：
adb server is out of date. killing...
ADB server didn't ACK
* failed to start daemon *
此方法解决不了。
（2）：查看端口号占用情况
>netstat -aon | findstr "5037"
TCP 127.0.0.1:5037 0.0.0.0:0 LISTENING 5932 TCP 127.0.0.1:5037 127.0.0.1:50462 ESTABLISHED 5932
查看任务：
>tasklist | findstr "5932"
tadb.exe 5932 Console 1 5,260 K
将此任务kill掉，然后重启ADT问题解决：
>taskkill /f /t /im tadb.exe
成功: 已终止 PID 5932 (属于 PID 5820 子进程)的进程。