Here's a link to my post in the MS Windows 10 forum.
So far I haven't gotten any replies from MS or anybody else. It's funny that the 32 bit version works but the 64 bit one doesn't. I guess the first one of us finds a fix can let the other know!
I just updated 2 desktops and 2 laptops in my home to windows 10. 1 desktop was Win & and 1 was Win 8 and the same for the 2 laptops. Everything looked good until I tried to use my home network (Workgroup & Homegroup). Now the 2 formerly Win 7 units can see each other but not the formerly Win 8 units and vice versa. When I try to use Homegroup it says there is an existing Homegroup and invites all 4 units to join. But after awhile I get a message that says the Homegroup no longer exists and to start a new one. But none of the units has the ability to start a new one, only join the unknown old which doesn't exist on any of these units. It might have been on the WIN8 desktop prior to a harddrive failure and a clean re-install.
Anybody have any ideas how to totally delete an old Homegroup and start over. I really don't want to have to do clean re-installs on 4 PCs. I would hope somebody from Microsoft can help.
Between this issue and the fact that you can't synch favorites on EDGE, I can no longer recommend the Win 10 upgrade to anyone with more than 1 PC.