Sono abbastanza sicuro di aver avuto questo problema dopo Acronis Backup & amp; Ripristinare 11.5 ha riprodotto il mio disco in un file .tib.
In seguito il sistema di origine e il sistema di destinazione sembravano aver perso C: \ windows \ inf \ usb.inf.
L'ho copiato dal mio netbook e da un 'Driver di aggiornamento' in seguito, se avessi riavviato la mia tastiera wireless logitech k400.
Questo sembra aver influenzato non solo i ricevitori unificanti Logitech, ma tutti i dispositivi USB Composite.
Il mio tablet Android è anche interessato, così come il mio ricevitore USB Controller Xbox 360 Microsoft, dal momento che ha due pad 360 sincronizzati ad esso, ma il mio PowerA Minix360 cablato non è interessato.
Anche il mio microsoft wired keyboard 600 e logitech V220 non sono interessati, in quanto non sono "USB Composite Device", ma "USB Human Interface Device".
Il dispositivo USB Composite viene utilizzato per racchiudere più dispositivi secondari in un dispositivo monoparentale, ad esempio due endpoint USB Human Interface Device (uno per tastiera, uno per mouse) come fa Logitech Unifying Receiver.
Grazie mille a lucvdv di answers.microsoft.com per averlo capito :
Some time ago, my system stopped recognizing some, but not all USB devices.
USB ports are fine, it reads the device descriptors but then either says
it's unknown hardware or says it can't find a driver for it.
A second symptom that must have started at the same time is that it
"forgets" all about some USB devices that have always worked fine before,
with the same result: suddenly either "unknown" or "can't find a driver".
Two weeks ago, it was my keyboard.
It still worked when I logged on (it had to, I used it to enter my password).
Immediately after logging on, the found new hardware thing popped up,
after a few seconds it said it failed to install my new hardware, and at
that moment my keyboard stopped working.
Never found a solution, I've been using a PS2 keyboard instead since.
I've tried other USB keyboards, it didn't recognize any of them.
Yesterday, it was the USB hub that's built into my monitor that
suddenly turned into an "unknown device", and nothing I connect
to it is detected anymore.
In an attempt to fix that, I launched the device manager and let it
scan for new hardware.
Result: instead of my USB hub starting to work again, my
Logitech wireless mouse stopped working.
The "USB receiver" is now listed with an exclamation mark,
"drivers for this device are not installed".
It worked fine just a few seconds before.
Right now I'm back to using a wired USB mouse, but I wonder how
long that's going to keep working.
It's not the receiver that's at fault: when I plug it in,
it shows up in device management with the right name and device ID:
USB\VID_046D&PID_C52B&REV_1201 - USB\VID_046D&PID_C52B,
and status "The drivers for this device are not installed. (Code 28)".
Comparing the contents of %SystemRoot%\Inf to another Win7-64 system,
I noticed that file USB.INF was missing.
Copied it over from the other system, started device manager and
re-installed drivers for the non-working devices, and the problem is fixed.
Grazie per la tua pazienza nel rintracciarlo, lucvdv!
