i am using eclipse for android development in windows 7. I faced the same problem before but the below link solved my problems.
http://stackoverflow.com/a/4094080/3870105
but this time it isn't working and also tried to kill adb.exe *32 process from windows task manager. It disappears from the process list and again gets there. So, as a result i cant run any app from eclipse. the erros is:
Please ensure that adb is correctly located at 'D:\DevTools Backup\AndroidSDK\sdk\platform-tools\adb.exe' and can be executed.
What to do now?