I've had two problems in the past after a Windows Update that were corrected in Settings, lock screen changed background picture - settings showed my choice but a different one was selected and grayed out when the list of options was opened, the programer's setting was in use not mine. Audacity would not recognize any microphone, a privacy setting had changed that I did not change. Windows feature updates always disables my Windows 7 installation and I have to reinstall it. No help in Windows Support or HowToGeek.com for your scanner problem. SO with the scanner connected and turned on
1. right click the start button and select Device Manager
2. right click the scanner in the list (expand as necessary) and select Update Drivers
3. Select Brows My Computer for driver software
4. Select Let me pick from a list of available drivers on my computer
5. Highlight the latest driver (or the one you want to use / try) then click Next, that driver will be installed for that device.
This may not solve the problem but it won't hurt.
I have a V700 on Win 10 and Plustek 7600i on Win 7 on this computer and a V500 on a different Win 10 computer.