SharePoint User Name Change

Hello,

I added a user to a group in sharepoint, and then learned his name was spelt marc not mark. I changed his name in AD, dropped it and added it to sharepoint and it still says Mark in sharepoint. I also tried completely removing the user account. I dont want to change the username convention. Please help!

I am comfortable in SQL if anyone knows the database and table this is stored in.
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markterryAsked:
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ivan_vaguninCommented:
Hi! User names are stored in a hidden list named Users on the root web. You can change user name using SharePoint 2010 Manager (http://spm.codeplex.com/) - just find user in Users list and change his name.
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markterryAuthor Commented:
When I try to run the program it crashes instantly and says windows is searching for a solution.
I can't find any installation instructions on the documentation section of that site. I am assuming I just extract and run? or do I need to install it to sharepoint somehow?

Can I use SharePoint Designer for same purpose?
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markterryAuthor Commented:
Nevermind, I can run it from the server.

However, Now I have found the "User Information List" but cannot edit, only delete. And when I try to delete, it gives me an invocation error.
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ivan_vaguninCommented:
Hi! Sorry, it's not "User Information List" under Lists node, that you should edit. You should edit "Users" collection under root web node.
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markterryAuthor Commented:
That list only has 2 users in it, where as the other list appears to have all users.
please see attached image. Is this the correct root? I think I have expanded every node possible.

 2 users only
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markterryAuthor Commented:
I figured it out, I needed to go the the all users list:
_catalogs/users/simple.aspx
And delete the user from their, then do added him to the group again and his name was changed. It may have also had something to do with a full member crawl.

Referred to: http://social.technet.microsoft.com/Forums/en/sharepointadmin/thread/5790cffc-2950-4ef2-a5bd-8938333230c2
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markterryAuthor Commented:
Figured it out another way, but thats for the help.
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ivan_vaguninCommented:
Yes, sorry I did not check this myself. It looks like SPM a little bit incorrect in this part.
So the solution is to use Power Shell. Execute following script:
$web = Get-SPWeb http://server
$user = $web.EnsureUser("userlogin")
$user.DisplayName = "New User Name"
$user.Update()
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ivan_vaguninCommented:
I meant SharePoint 2010 PowerShell
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