Change user folder name of Administrator account

Hello -
When I did my initial install of Win7 (fresh install) I created my Administrator account with the name of "Denis". I would like to change the name of the Administrative account to "denisl". I went into control panel and changed the account name, which worked, but the folder remained named as "Denis" under the "users" folder. How do I rename the folder named "Denis" to "denisl"?

Thanks!

ok, I followed the instructions and it appears to have worked just fine. There is one slight concern...
The instructions, Step 22, say that for the built-in Administrator account to use the Local Security Policy Editor to change the name. This is Win7 Home Premium (not Professional, Ultimate or Enterprise). Can I just skip that step or is there an alternative procedure?

perfect. Thank you!

Something interesting which makes me think my username change is not 100% complete.

I'm using Macrium Reflect to run an image backup - which works fine.
I am now scheduling a daily backup through Macrium which will execute a XML file called "My Backup".
Under the Macrium scheduler, a dialog box opens and asks for details to run the XML file job/backup.
There is a box that says "Run as user" and there is a pre-loaded text in the box which is computername\user
The user is "Denis", not "denisl". Where is Macrium reading the old user of "Denis"? I just installed Macrium free version today, after changing the user name from Denis to denisl.

Thanks

Ok, that makes sense and is something I could live with. I looked at the security tab of my user folder and just like it's stated in the tutorial - the owner is the old name.

Out of curiosity, how would I delete the Administrative user, now "denisl", and create a brand new one thus deleting all references to the old "Denis" name?

This is a brand new fresh install of Win7 so there is not much that I need to preserve under "denisl" or "Denis".