Delete Sharepoint 2010 groups, sites already deleted

I am trying to clean up the security groups for SharePoint 2010.  We have several sites that have been deleted over time. There Sharepoint security groups associated for these sites that I would like to delete.  I'm having troubles finding relevent information on how to delete these groups.  I'm going to assume I will have to do it from the Powershell console for SharePoint.    Does anyone know how to do this?
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cknodererAsked:
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cknodererAuthor Commented:
I have gone into the People and Groups section, clicked on the icon next to the group, gone to the bottom, clicked the DELETE, then clicked OK on the popup asking if I wanted to delete the sharepoint group. After clicking OK, nothing happens.  I am a farm administator.  I've done the steps below and removed all users from the group then tried to repeat the steps above with the same results.  No luck. :(

1.Go to Site Actions -> Site Settings -> People and Groups
2.Click on the group and check all the users -> Actions -> Remove Users from Group
3.Click on Settings -> Group Settings -> then click delete at the bottom of the page
Walter CurtisSharePoint AEDCommented:
Make sure you open Central Administrator as an admin. If need be, start CA from the start menu with the "run as administrator" option.

If that does not do the trick, you may need to change the group owner to your account or an account that can remove the group. You can check the group owner from Group Settings, found in the ribbon when the group is opened.
Justin SmithSr. System EngineerCommented:
You need to do this from the root site and it must be on the "groups.aspx" page.  Navigate to Site Settings - People and Groups - click the "Groups" link on the left nav.  Delete them from here.

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cknodererAuthor Commented:
This still is not working for me. I've tried both answers. Neither are working.
Justin SmithSr. System EngineerCommented:
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