Autologon en xp, sin tweakui

Start regedit.exe (Start - Run - regedit)

Open the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\Current Version\Winlogon

Double click the DefaultDomainName and fill in your domain name

Double click the DefaultUserName and fill in login name

From Edit menu select New String Value, and enter DefaultPassword as name of value

Double click the DefaultPassword and enter in the password

From Edit menu select New String Value, and enter AutoAdminLogon as name of value

Double click the AutoAdminLogon and set the value to the number 1

Close regedit