Since you're using Homegroup, make sure IPv6 is enabled. Also, make sure the IP Helper service is running. To do that, in start menu search box, type services.msc, then hit enter.
Type cmd in start menu search box, hit enter. Then in the black box, type ipconfig /all, hit enter. Please post a screenshot of this and we will probably be able to help you then if you still need.
Have you tried filesharing using Netbios and homegroups disabled? If you don't know how, we could help with that also.