Different USB device behaviour on two machines

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http://superuser.com – I have DVR which connected to PC via mini-USB cable. When I connect it to my home PC, DVR turns on, Windows makes the "recognize device" sound and then DVR turns off. If I connect DVR to my laptop, DVR turns on, windows recognize it, and then i can read videos from DVR. What is wrong with my PC, any suggestions? (HowTos)