Solve the problem that Win 7 can no longer be used after exiting the USB flash drive.

There is a child's shoe. After her USB flash drive is found, the USB flash drive is inserted again. It is found that Windows 7 cannot recognize the USB flash drive. You must restart your computer to recognize it again. What is the matter? Here's how to solve this problem: Right-click on the Windows 7 desktop mouse and click on "Computer"; select “Properties". Click on the "Device Manager" in the top left corner, and then pop up "Device Manager" window, click to expand "Universal Serial Bus Control", there are many rows of "USB Root Hub" device list, I am here There are as many as eight. Right-click each "USB Root Hub", select “Disable” menu, then “Enable”. By doing this every "USB Root Hub", Windows 7 can recognize the USB drive again without restarting.