How to get the Administrator account on the Welcome screen.

Start >> Run >> Regedit
HKEY_LOCAL_MACHINE >> SOFTWARE >> Microsoft >> Windows NT >> Current Version >> Winlogon
Add a new key called "SpecialAccounts"
Inside the new "SpecialAccounts" key, add a key called "UserList"
Within the "UserList" key, create a 32-bit DWORD value called "Administrator" and set its value to 1
(Or if you are going to rename the Administrator account, create a 32-bit DWORD value to match and set it to 1)
Close Registry Editor
Start >> Run >> control userpasswords2
Click on the Advanced tab >> then under "Advanced User Management" click the Advanced button
Next, click on Users and right click the Administrator account and select Properties
remove the check from "Account is disabled"
(If you wish, you can rename the Administrator account and set a password for it here)