Computer Hangs When Accessing Kinect Using OpenCV

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I am using Kinect for Windows with OpenCV. I was initially doing with one kinect only. It worked fine. I wanted to work with two kinects. So , I had to install extra USB controller as I saw posts about that. When I try to access second kinect computer hangs and I would have to restart the computer.

Execution will reach up to: capture2.open(CV_CAP_OPENNI+1);

and while executing this it will hang. It shows perfectly in device driver that kinect is connected. And I tried connecting other peripherals with newly installed USB controller, they seem to work fine.

I tried only connecting one kinect with new USB controller , but same thing happens.

Can anybody help me? I am stuck here.

Thank you.