If you decide that you no longer want to belong to a HomeGroup, you can leave it by removing your computer from it but remember that once you leave a home group you will no longer be able to access files, folders and printers that other people have shared with that group. Leaving a HomeGroup in Windows 7 is just easy as joining one which you can easily rejoin it later if you change your mind. Follow this tutorial to find out how to remove your computer from a home group.
To get started follow steps below:
Step 1: Click Start menu and choose Control Panel
Step 2: Once you are inside Control Panel, use search box available in top right corner and type home
Step 3: Click HomeGroup from the results
Step 4: Now at the bottom of new window you will see a link Leave the homegroup…
Step 5: In next window confirm that you really want to leave a home group by clicking Leave the homegroup, wait for few seconds and then click Finish
Now you computer is no longer a part of homegroup.