My scanner is thunis e53, and the scanner driver is installed without problems, but it can't be used for a day or two, which means I can't find the scanner.
If you are using XP operating system, you can check it in the system properties-hardware-driver signature. It is recommended to select "What do you want Windows to do?" Select the warning, then enter the installation manager, reinstall the scanner driver, select "Yes, only this time" in the new hardware installation wizard, and then have a look. If there is still a problem, it is recommended to change a USB cable and try again or USB interface.