I assume you have tried to reinstall the software?
Go to Control Panel/DeviceManager or Printers and other hardware[depending on your version of windows]
look for the scanner item and see if there is a yellow! or? if so click on it and click remove.
Restart the computer, and fllow the scanner software installation instrucion precisely.
See what happens. I do not know your particular scanner and its software- but it is normal to activate the device via software on the computer not directly from the device.