Thank you for your response. I am running Windows 8 Version 6.2 (Build 9200). The new computer is Windows 11.
On the Windows 8 computer, for the C: drive properties I enabled Sharing and gave the C: drive a sharing name. On the Windows 11 computer, when I try to map a drive to the share name, I get a message, "Windows cannot access...". If I try to map a drive by browsing, I get a window that says "Network" with nothing in it.
Both computers are connected to a common router, which is used to access internet.