Spelling in corect on my user name Incredimam

1. From an account with administrative privileges, go to Control Panel>User Accounts and create the new Standard user account named the way you want and at least one extra Administrator account. Call the latter "CompAdmin" or "Tech" or the like.
2. Log into the new Standard user account once so the profile files/folders are created and then log into CompAdmin.
3. Now go to Control Panel>System>Advanced>User Profiles>Settings
4. You will see where you can copy user accounts. Copy the old account to the new one from there. Use the Browse to select your new account (C:\Users\newaccount).
5. Log into the new correctly named account and make sure all your stuff is there and that it works the way you want. When you are satisfied, you can log out and into CompAdmin and delete the old user account from Control Panel>User Accounts.

Source: http://answers.microsoft.com/en-us/windows/forum/windows_7-security/how-to-change-user-name-in-windows-7-professional/d95ddaa7-4235-454e-83d6-77232207c7e2