Boot up Windows before you even log in
1.Download Microsoft’s free TweakUI tool and install it.
2.Click your Start button, go to your Programs menu, and select Tweak UI from the “Powertoys for Windows XP” folder.
3.In the TweakUI window, double-click the “Logon” item in the left-hand column to expand it.
4.Click on the “Autologon” item underneath the “Logon” section.
5.Check the box that says “Log on automatically at system startup”
6.Click the “Set Password” button and enter in your windows login password
7.Click OK and close Tweak UI.
8.Download this .reg file and run it. When it asks you if you want to merge it with your registry, choose “Yes”.
NOTE: If you feel queasy about merging a reg file with your registry, you can also add it by hand. Go to Start > Run and type in “regedit” and press OK. Browse to [HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run] and create a new String Value. Name it “Lock Computer on Startup“, and set the value to “rundll32.exe user32.dll, LockWorkStation“
If you don’t use any Windows XP login security, then you can skip this article.