Android – nexus 7 disconnects from windows / eclipse / ADB

My nexus 7 used to work well on Windows 7 64bit, but now suddenly when I connect it, it shows me a new device screen. It displays nexus 7 and Android 4.3 in eclipse / ADB (correct), and then disappears. The second or less after the device is disconnected in ADB log

Then, ADB reports it as "offline", and the operating system is unknown

I tried three different USB cables, different USB ports, and on my Mac (although not my main device), the device worked well. It was frustrating. I tried to set up a connection with PTP and media devices. Neither helped

resolvent:

Try disabling and re enabling USB debugging

Try this too:

    1: uninstall the driver in the device manager with option "delete the driver software for this device"
    reconnect the Nexus tablet
    2: let windows install a default driver which will be inadequate
    3: uninstall again the device in the device manager with the option "delete the driver software for this device"
    4: let windows try to find the driver, this process will fail
    5: go back to the device manager and right click the Failed device and update driver
    6: choose the driver location in the android sdk directory (android/extra/google/usb_driver)