thank you for reply. Luckily I solve uninstalling an HP application (HP ENcription Tool) that was installing the worng driver
Mfeepepc.sys. In last days I had problem inserting usb devices and SD Card inside e integrated SD Reader of my HP Laptop. I found also something similar (about the driver problem) in the McAfee website: https://kc.mcafee.com/corporate/inde...ent&id=KB73146
(but I have Windows 7 x64 OS). Also I uninstall all McAfee programs but I have yet the McAfee Driver installed to manage the disks.
I will inform also HP technical support that has not idea of the problem (I try to solve last week with the online support chat).
Thank you again.