When I try to create a HomeGroup I go through the steps by going into the control panel, click HomeGroup then create HomeGroup, click next, select what to share click next and I get
Try this:
In File explorer, go to C:\Windows\ServiceProfiles\LocalService\AppData\Roaming\PeerNetworking
and move the file idstore.sst to a safe place (just in case you need to replace it)
Try again to create a homegroup.
A Homegroup is for sharing your files or printers across a home network. So if you had two pc's in the house you could use a Homegroup to connect them across a network. This web page may help: