HomeGroups & sharing Libraries/Printer problems

Good news and bad news:
:
On my win7Pro machine network printing works fine.
But the 'sharing Libraries' doesn't work.

But my win7HP machine can't print.
And the 'sharing Libraries' doesn't work.

Turns out each machine has a different HomeGroup password.
I think i need to kill the HomeGroup on win7HP,
and then JOIN the win7Pro HomeGroup.
But how do I do that?

Thanks...Vernon

In Control Panel (icon view) click on homegroup and there is an option for leaving the homegroup. When finished then you should get an option to join a HG. Enter the same password as the remaining HG.