1、首先下载最新版adb.exe工具包
2、解压后把找到adb.exe、AdbWinApi.dll、AdbWinUsbApi.dll这三个文件
3、把那三个文件复制到C:Windowssystem里
如果您已经按照上诉方法进行操作后还是无法正确启动，可以参照下面几个方法进行操作
1.报错：
BUILD FAILED
D:workspaceganjibuild.xml:144: The following error occurred while executing this line:
D:workspaceganjibuild.xml:271: Unable to delete file D:workspaceganjitmpPRoguardtmp.jar
解决：
已经开了一个模拟器了，无法重新编译，必须关闭一个。用于ant
2.报错：
The connection to adb is down, and a severe error has occured.
解决：
cmd跳到sdk tools文件路径下
adb kill-server
然后再adb start-server
3.报错：
The connection to adb is down, and a severe error has occured.
[2010-03-11 09:36:56 - HelloOPone] You must restart adb and EclipSe.
[2010-03-11 09:36:56 - HelloOPone] Please ensure that adb is correctly located at 'D:OPhoneSDK_1.5
platform-toolsadb.exe' and can be executed.
解决：
方法1.cmd中adb kill-server，然后adb -startserver
方法2.方法1不管用，那么在任务管理器中杀死adb.exe，然后重启eclipse。
方法3.方法1和2都不管用，那么查看最后一句报错中：platform-tools中是否有adb.exe(我的错误就是在相关路径下面没有platform-tools文件夹
，所以我选择新建一个文件夹，并且把tools中的文件全部复制到platform-tools中)