Hello, From my app, I install tap adapter. It installs but multiple times. Like in 32bit systems, it asks for "Uncertified logo .... " with 2 buttons "Continue Anyways" and "Stop Anyway". If you press once "Continue.." btn still it asks the same question untill you press "Stop Anyway". Any how many times you clicked "Continue..." the adapter is installed that many times. Like if you clicked 4 times "Continue ..." button, 4 adapters are installed on the system. In 64bit system, it acts little bit differently. It asks if you want to install Y/N. You click Yes and it installs 2 times and the chapter is over. It wont ask another time or so, but in once only it will install 2 adapters. Why is this strange behaviour ? Has anyone experienced the same ? Is any settings or so required for the windows to stop it acting like this ? Any help is highly appreciated. Arthur Xie: I think its a development come technical question. The development side is done, but the technical side is not performing correctly, so have kept this question. As you guys might know the answer to it and I need to implement it in code. Still, if you feel this forum is inappropriate, will mark your answer as "Correct" and you may delete this question. As you say. This is just my thought. Thanks