Two Dells not communicating

I have a Dell Inspiron desktop with Windows 7 and a Dell Inspiron laptop running Windows 10 connected to router via Ethernet. Both recognize each other in Explorer but both give me "cannot access" when trying to view files in shared folders. Diagnostics gives me "missing network protocols" but doesn't tell me where to get and install said protocols. Is there a fix for this, or other troubleshooting steps?