I can not open windows on my Dell XP computer please help it is a used pc owner left it behind when they moved.I would like to fix for my grandchildren.TY
You'll most likely have to reinstall the operating system.
Start in safe mode. In order to do that press F8 before the Windows XP boot screen. If that was done correctly, you should see a default account named 'Administrator' afterwards and hopefully it should not have a password. You can create another account in 'Control Panel'.
If the owner left it behind, you should definitely reinstall the operating system anyways. His/Her data is not your own so a reinstallation will help to overwrite his/her data. Accessing an administrator account is simple enough without cheesy software, but in this situation you should do a reinstall.