DJM T1

@John > Is the DJM-T1 showing up in the Windows device manager?

Hi it does show up but it has a "!" inside a triangle. When I right click properties, in the text box it says "Windows cannot verify the digital signature for the drivers required for this device. A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source. (Code 52)". When I install the older driver from the CD, it detects the mixer. 

Thanks

@John > That tells me it's possible you either have old drivers, or haven't updated Windows fully to update the security certificates to match the drivers. There was a change last January to migrate from Pioneer Electronics to Pioneer DJ, and as such the certificates had to be updated with both Microsoft's registry and on the drivers. If they don't match, that can be why you get this error.

Try running the Microsoft Update first, then reinstall the current drivers.

I have done all the updates for WIndows on my lenovo laptop, however it is still having same problem. I notice that a pop up on the bottom right saying the driver was not successfully installed when I connect or turn on the mixer. 

@John > Did you completely REMOVE the hardware device & drivers before updating and reinstalling?