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Then I browsed to the driver location (trying the driver from both from the install cd and the one in the package I downloaded from the Amazon page where they say to get the latest drivers), but the Hardware Update Wizard tells me the update was unsuccessful because it couldn't find a better match for the hardware than the currently installed driver. (I'm positive that's my DDS120, because when I unplug it, the "WinUsb Device (NULL)" disappears.) So I gave up using USBDeview and tried updating the drivers by right-clicking on the device in Device Manager and selecting “Update Drivers”. I was amazed to see that did not happen: when I connected the DDS120 I got no New Hardware message, and when I looked in the Device Manager, there was that "WinUsb Device (NULL)" again. My expectation was that this would delete the device's driver and that when I next connected the DDS120 I would be prompted by the New Hardware Wizard to point at a proper driver.
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I right-clicked on the DDS120 shown as "WinUsb Device (NULL)" in the Device Manager, checked its properties and saw that there were no drivers installed for this device! I downloaded USBDeview (cool program - thanks for showing me that!) and see the WinUsb (NULL) device in the list, but it shows that it’s not connected so nothing happened when I clicked on the red X to disconnect it. Hi Bobi! Thanks so much for your reply, and I think you’re correct that my problem with Leidoskope not being able to open my DDS120 is that I don't have the correct driver installed. Anyway, it’s nice to know others have got this thing to work properly, so I’ll persevere but would appreciate any ideas you might have! Regards, Cam Sorry about the long post, but I wanted to make sure I covered all possible sources of error! I don’t have a Windows 8 machine to play with but am thinking of getting one. I am using the cable supplied with the DDS120. All of this happened while DDS120 was plugged into a powered USB hub, but the same thing happens when I plug directly into the laptop’s USB port. The DDS120 programs (both v1.2 and v1.3) still crash on startup and OpenHantek (Ledioskope) can't open the device. To get that to work I first had to uninstall the. NET 2.0 using the dotnetfx20 installer on the installation cd. Does your unit show up as "WinUsb Device (NULL)"? I did install. There’s no yellow “!” or “?” showing, so I think the driver installed successfully. (I thought those would be the latest version, but that’s where I got v1.2 of the DDS120 software package, and the installation cd that came with the unit has v1.3 so I guess that’s later.) The DDS120 shows up in Device Manager as "WinUsb Device (NULL)" under "Universal Serial Bus devices". When I connected the DDS120, I got the “Found New Hardware” wizard and pointed it to the drivers in the package I downloaded from the site mentioned in the Amazon product description. I'm puzzled! To answer your questions, yes I did install the drivers and didn’t get an error message. It inspired me to tackle the DDS120 again, and I’ve tried a bunch of things but the DDS120 programs (both v1.2 and v1.3) still crash on opening so I’m puzzled about that, and also OpenHantek still gives me "Couldn't open device 005:003: Operation not supported or unimplemented on this platform".