The first time you connect a flash drive, Windows automatically picks up and installs the software for it. If this does not happen, an entry appears in the pop-up window that the driver for the flash drive was not found. Most likely, this is a problem that has arisen in the operating system.
If you are sure that the USB drive is working (it works on another computer), first of all, just restart your PC or laptop. Sometimes it helps. Otherwise, go to this page and follow the recommendations described there to restore the system.