AiO has its own copy of adb.exe and may be a different version than the one supplied by Bluechip, but that doesn't matter. What does matter is that if you are already running one adb.exe, you must stop (kill) it before running the other adb.exe. The command for stopping adb.exe is
adb kill-server.
Do "adb kill-server", do "adb start-server" making sure that nothing is using adb.exe from anywhere.
If you get some new looking errors then Droid Explorer is the problem.
Thanks lot, Cat and andyabc. will try tonight when I back home and report back.
From you guys instruction, I realised I have one automatic started mobile antivirus software using adb. after stoping that software, rooted tablet successfully with AIO in one minute. thanks again. :laugh: