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I was able to apply your XML file and get my computer to recognize the cable as a USB Blaster. I was then able to successfully apply the drivers from the Quartus installation.
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Great!
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I am still unable to get SignalTap to detect my device however, and I do not have blue light on the USB Blaster. Getting much closer to success though! Thanks a ton for your help so far!
Quick edit...I get blue light when scanning the chain, but not otherwise...May indicate the problem is on the board side?
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If you were able to use the USB-Blaster to program the FPGA, then it should detect the SignalTap II instance correctly too. Check your Quartus project settings, perhaps you did not enable the SignalTap II instance in the build (look in the hierarchy tab in the main display to see if its included within the design).
Cheers,
Dave