I have a truoble about USB , I have just fomated it . But when I connect it again in Computer , My computer show a message that need install a security device . I don't know it . and my USB isn't used .
Check it with other computer. Is it the same warning?
So you can determine the trouble, your computer or usb drive.
If it is your computer, then check the sofware fist (system device, driver or windows).
If it is not software, check the usb conection if there is dust or dirt.
If every thing is okey, it must be caused by motherboard failure.