How to use Home Group and how to fix Home Group problems if it stopped working properly

Here is a simple tutorial regarding how to use Home group:

How to Set up:
http://www.dummies.com/how-to/content/how-to-set-up-a-homegroup-in-windows-7.html


How to Join:
http://www.dummies.com/how-to/content/how-to-join-a-homegroup-in-windows-7.html


If it is not working then:
http://www.techradar.com/news/software/operating-systems/windows-7-homegroup-not-working-try-these-quick-fixes-912305


Why cant I access my Home Group:
http://windows.microsoft.com/en-gb/windows7/why-cant-i-access-my-homegroup


Why cant I join my Home Group:
http://windows.microsoft.com/en-us/windows7/why-can-t-i-join-a-homegroup



 Also useful:
http://helpdeskgeek.com/windows-7/windows-7-cannot-connect-to-homegroup/


 For printer sharing:
http://windows.microsoft.com/en-gb/windows7/share-a-printer