Have a look here:
http://www.windows10forums.com/thre...-installation-of-version-1511-kb3103688.4917/
Hey, I found a link to a solution that worked for me.
http://www.tenforums.com/network-sh...d-my-missing-network-homegroup-computers.html
Here was the solution:
After the Win 10 Threshold 2 Upgrade, many users are having Networking issues, especially not being able to see other PC's on the network in File Explorer's Network panel and Homegroup panel.
I have 3 Laptops on my network and encountered this issue and have spent several days tweaking all sorts of settings and trying many solutions I saw online. Finally one worked and now I can see all 3 Laptops in each panel in the Network section and all 3 Laptops in each panel in the Homegroup section. So everything is back to functioning properly.
This is what worked for me:
Open the services menu by clicking start and then typing 'services.msc' and pressing enter.
Look for the following services in the list:
· DNS Client
· Function Discovery Provider Host
· Function Discovery Resource Publication
· Peer Networking Grouping
· HomeGroup Provider
· HomeGroup Listener
· SSDP Discovery
· UPnP Device Host
1. I reset each of these settings FROM "Manual" TO "Automatic" one by one.
2. Right after doing each of those changes, I RESTARTED each service.
3. On two of the Laptops I had to LEAVE the Homegroup and REJOIN it.
4. I shut down all the Laptops and restarted each back up one at a time, starting with my primary Laptop which was the creator of the Homegroup.
Everything is displaying perfectly now!
The only other change today was I got this Cumulative Update which updated Win 10 on all 3 Laptops.
Cumulative Update for Windows 10 Version 1511 for x64-based Systems (KB3118754)
I'm not sure if that KB3118754 update had a part in helping fix things or not, but the update did install before things started working again and I did these changes above after the update.
Win 10 is definitely quite a bit of work to maintain compared to prior versions of Windows, and you have to be really tech savvy to know what to do when things stop functioning. I can't imagine how users who don't have tech mind skills are handling it.
Good Luck to those having this networking issue. There are a ton of users experiencing problems, so Threshold 2 definitely has serious networking bugs.