Please could you let us know what the VID for the Arduino device is?
To find this:
- Open Device Manager and right-click on the COM port entry corresponding to the Arduino board.
- Select 'Properties' and select the Details tab.
- Select the Hardware Ids item from the 'Property' drop down list as in the figure below.
In this case we have tested an Arduino Uno board with a PicoScope 3204B and 2202 device on a laptop running Windows 7 64-bit without any issues. I've not had a chance to test a 5203 device just yet.
I'll provide an update as soon as I can.