Do you know that C:/Users/*Username* folder actually so difficult to be changed its name? It because username in the folder also becomes reference for hundreds of registry entry used in Windows.
But if you want to rename this User folder, you can do it by a little trick from SpyOnTech here:
1. Create new User Account via Start -> Control Panel -> User Accounts and Family Safety -> Add or Remove User Account.
2. Create New Account.
3. Give name as you wanted, then give Administrator privilage.
4. After that, there will be 2 user accounts, which are old user and new user with name you wanted.
5. Restart your computer, press on F8, then Boot from Safe Mode, and Login by the new account.
6. Open Windows Explorer, then right click and rename C:/Users/*OldUsername* as the name you wanted.
7. Set both folder to be merged into one and the file inside it replaced.
8. Now your *OldUsername* folder would be duplicated in *NewUsername* folder.
9. Lastprocess, access Start -> Regedit.
10. Access HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList.
11. Right click on ProfileList folder, then click on Find.
12. Type on your *OldUsername* then click on Find Next.
13. Double click on ProfileImagePath, then change C:\Users\*Oldusername* into C:\Users\*NewUsername*.
14. Restart and reboot into normal mode. Login to your new account, then make sure that the old account has been migrated completely into new account and there’s no error.
15. After you are sure the migration process of old account into new account is succeed, delete the old account via Control Panel -> Add or Remove User Accounts.
16. Last, you can delete *OldUsername* left via Safe Mode. Finish!
Now User folder in your Windows has changed as you wanted. Easy, isn’t it?