So I'll summarize. In short when this happens you want to turn off the computer that hosts the homegroup so you can create one on the PC that will always be on.
Here's a link (one of hundreds) about this.
And the hundred others:
So I have been trying to set up a homegroup but it appears that it has already been set up... on out main computer it states the homegroup is from the laptop, and on the laptop it only sais join now, no print key or anything. I've tried doing several things I've found on this forum, all to no avail. Could there possibly be homegroups set up on both these computer (there is another laptop and says join as well but is not always in the house but still needs to join the homegroup). Any help or links would be grand. Added a snippet here: link to show what it looks like. Happy to give further information to help me clear my problem.