Automatic Administrator Login:

Well here's the trick which you can use to prove that Windows XP is not at all secure as multi-user operating system. Hacking the system registry from any account having access to system registry puts you in to the administrator account.

Open REGEDIT(Win Key +R) and Go to Key Below

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]

You Wind Find DWORD AutoAdminLogon
Just Double CLick and Set It to 1