I have a Windows 10 desktop computer which is my main device. It's password-protected and I'm not concerned about it being physically accessed by bad actors.
I have a Windows 7 laptop with a fresh OS install and only a few programs installed. I'm using it as a dedicated computer for running a laser cutter. Both the laser cutter and the laptop are in the garage. The laptop user has no password, so anyone with physical access can boot it up and get into an admin-enabled user unrestricted. The laser cutter software, unfortunately, only works when run as administrator, so the user must be able to run programs as administrator.
Both computers are on the same home network, and in the same Workgroup.
I have a network-shared folder on each computer to allow me to easily send files to the laptop for use on the laser cutter without needing to go back and forth with a thumb drive. The idea is I can drop a file in the shared folder on my desktop PC, walk over to the laptop, and grab the file.
I want to have acquaintances from my local area be able to bring their own files, usually on thumb drive, and use them in the laser cutter.
I am not concerned if I have to nuke the laptop and install the OS again if it gets infected, but I am worried that an infection on the laptop could spread to my desktop through the shared folders. Is this something I need to worry about? Are there any other vectors whereby malware on the laptop could infect my desktop (without user action on the desktop, such as running an .exe from the shared folder)?