1. Set it to defaults.
2. Please make sure you can see the cursor on the screen and you can input something with your keyboard.
3. Please try the different codes to avoid your codes are not well made or printed. Btw, the scanner does better with white and black code instead or colorful background.
4. Please try different USB port just in case the PC problem.
5. Please contact us hen send us a clear pic of the code and tell us what kind of code it is if you know.