eclipse调试运行时报错：The connection to adb is down, and a severe error has occured.

Question

[2013-03-06 03:45:24 - sphone_ly] The connection to adb is down, and a severe error has occured.[2013-03-06 03:45:24 - sphone_ly] You must restart adb and Eclipse.[2013-03-06 03:45:24 - sphone_ly] Please ensure that adb is correctly located at 'F:\Android\android\android-sdk-windows\platform-tools\adb.exe' and can be executed. 请大侠们帮帮忙！！！！

Answer 1

where is adb.exe