If you are a Windows 7 user, you can delete a homegroup by using the following steps:

  1. Open the Start screen and type “cmd” (without the quotes) and hit enter.
  2. Type “netstat -a” and hit enter.
  3. Look for the “HomeGroup” entry in the results and click on it.
  4. Click on the “Delete” button and confirm your deletion by clicking on OK.