The two machines, at that time, were the only two machines involved. A "look" at my router showed nothing else connected to that.
Comodo not running "identical" rules? I set everything up, it's a bit beyond the PYT, so I know what "rules" I allow. Everything was identical, trust me.
Avira, in my case, is the free antivirus only. It's not the full internet security package any more than the Comodo package had it's own antivirus installed. No holes in this cheese, I'm afraid.
Could ping either PC, depending on which one I tried to set up network. That was ok. Didn't stop the "password is incorrect" issue.
One of the two machines which I was originally trying to connect up still runs Comodo and Avira. When I tried to set up the network from that machine I still had the same issues (trust me, this went on for a while with constant deleting of homegroups and making them from the other machine, back and forward, back and forward) when I tried to connect with the netbook. So why did the problem disappear when the netbook got "modified" and not the desktop since the same issue appeared when the desktop "created" the homegroup before the netbook got modified? And why did it suddenly work, desktop creating the homegroup, after the netbook got modified?
When I went back to whatever PC was the originator of the home network to make sure the password generated by Win 7 was written down properly, it sometimes came up with a completely different password. That confused me.
Buggrit, now you have me in the mood to experiment once I finish modifying the desktop PC (loads of stuff being deleted and moved so a partition can be formatted to allow the win7 install to be moved there, gives me space for another hard disk, you see). First Comodo will go back on just to see what happens, then Avira then I'll see what happens. Don't mind "experimenting" on this netbook, everything that is important is on the desktop and a 1Tb external so if I bugger things up here it doesn't really matter.