If you're having problems with your scanner being able to scan to a network folder on a Windows 7 computer, it's because Microsoft's January 2019 update rollout introduced a bug which broke things. This will also have caused problems connecting to network shares or network folders on Windows 7 computers. The problem, and fix, are described further here: https://www.bleepingcomputer.com/news/microsoft/microsoft-releases-kb4487345-update-to-fix-windows-7-share-issues/
Please let me know if you need some help with this one. It should be as easy as installing the patch they released to fix it, and restarting the affected computer.