Haunted by previous homegroup

[SuperBob]

I recently reset my Windows 10 desktop PC. Now I can't create a new homegroup (my PC seems to think I have been invited to a homegroup on my own machine (naturally I cannot remember what the password was). There s no option to leave the group (since it thinks I have not yet joined it) nor will it let me create a new group (just says it can't - no reason). Meanwhile if I create a group on my wife's laptop it works just fine except my PC doesn't get an invite and tells me there is no homegroup on the network. I suspect this is all do to my PC having developed a split personality since the reset and somehow w has a record of the previous homegroup it had created before the reset. Any exorcists out there that can purify its soul? All help gratefully accepted.