“MTP Device” keeps popping up (Windows XP/Vista/7)

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Connected via USB to my PC with Windows XP, it does not work: the PC continuously discovers a new “MTP Device” but the device never works (error code 41). The problem seems to be fairly common, but the solutions found online did not work.

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Moreover, the problem does not seem to be limited to this particular device: it seems to be spread over many devices that expose a Media Transfer Protocol inteface (MTP indeed).

Taking a look at setupapi.log, we see that the device class is:

EEC5AD98-8080-425f-922A-DABF3DE3F69A

Open the register, go to:

HKLM\SYSTEM\CurrentControlSet\Control\Class\{EEC5AD98-8080-425f-922A-DABF3DE3F69A}

...and we note that there is an UpperFilterKLFLTDEV. Too bad that this device does not exist...seems to be a remnant of an old Kaspersky installation. Deleted the UpperFilters key, the problem is solved without even the need to reboot.

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