You may have tried this already, but are you using the same USB cable, check that the cable is not faulty, i.e. try another cable if you a haven't already.
Does the PC you are using have USB 2.0 interface?
What operating system are you using?
Do you have admin wrights?
In terms of looking for the ADC200, you are using PicoScope 5 which requires you to Select File->Setup->Converter and then choose the device from the list.