How to Change the User Folder Name of a User Profile in Windows 7
Normally, you could change your account name in User Accounts from the Control Panel (icons view), but that still would not change your accoun's user profile folder name in C:\Users.
This will show you how to change your account name and change the user profile folder name of any user account, including the built-in Administrator account (if enabled), in Windows 7 without losing anything in that user account. This will affect the user account's name for the C:\Users\(user-name) folder, Start Menu, Log on screen, Welcome screen, security permissions, etc......
You must be logged in as an administrator, and is a different account than the account you are changing...