How to Login to/Open Windows XP Without Password
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1) Power On your Computer.
2) Wait for your Windows to load files.
3) You'll reach Login Screen of Windows (where it asks password).
4) Now Hit Twice Alt+Ctrl+Del (on your keyboard), It will show another Login Window.
5) In the User name field type Administrator and leave the Password field blank. Click OK to Login to your Windows Administrator Account.
If the Username Administrator doesn't work replace it with: Admin or User or User1
Done!