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I can't use any USB flash drive in my computer, as when I insert them, there is an error that says that I can't and if I want to format it.

It happens with every usb and just when I log in with my user account for the first time. For example if just after switching it on, I log in with another user, they work fine. If after this I log off (not reboot) and log in with my user, they work fine as well.

If I log in with my user but in safe mode, they work fine as well.

I would say it is a virus but I don't seem to have any virus or malware (I passed my antivirus [eset nod32] and my antimalware [malwarebytes] both on "normal" mode and on save mode. I also cleaned my computer with ccleaner and cleaned my USB cache and inserted every USB again (this seemed to work but a day after this, it happened again).

I don't know what else to look/do.

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I suggest you create a new user profile and see if the USB drive works with it. If it does work then you actually do have malware on your system. –  Ramhound Feb 13 '13 at 17:36
    
I'm guessing it will work but then, what should I do to find & erase it? –  eryel Feb 14 '13 at 8:15

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