How to login as Administrator in Windows XP?

How to login as Administrator in Windows XP?

The built-in Administrator account is hidden from Welcome Screen when a user account with Administrator privileges exists and enabled. In Windows XP Home Edition, you can login as built-in Administrator in Safe Mode only. For XP Professional, press CTRL + ALT + DEL twice at the Welcome Screen and input your Administrator password in the classic logon window that appears.
To have the Administrator account display in the Welcome Screen, try any of these two methods:
Method 1:

Using TweakUI Power Toy for Windows XP Open TweakUI and click "Logon" option in the left pane. Put a checkmark against the option "Show Administrator on Welcome Screen". Click OK to close TweakUI. Logoff and see if Welcome Screen lists Administrator login. Changes are immediate and you can use the Winkey + L to switch back to Welcome Screen to see Administrator account is listed.
Use this procedure to hide/unhide any user account from the Welcome Screen. Please remember, you can still login to a hidden account using CTRL+ALT+DEL classic logon method, but cannot Fast User Switch to a hidden user account.
Method 2 -

Manual registry edit *
Click Start, Run and type Regedit.exe
* Navigate to the following key:
HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Windows NT \ CurrentVersion \ Winlogon \ SpecialAccounts \ UserList
* Use the File, Export option to backup the key.
* Right-click in the right pane and select New DWORD Value.
* Type-in Administrator as the value.
* Double-click Administrator, and assign a value of 1
* Close Regedit You may use this procedure to hide/show users in the Welcome Screen for any user account. Type the account name accordingly in step 5. For Windows XP Home Edition: While you can configure Windows XP Home Edition to show Administrator account in the Welcome Screen, you cannot login as Administrator in Normal mode. Boot into Safe Mode to login as Administrator.