A recent clarification of forum rules has indicated we can supply a method to access a computer with a lost/forgotten password.
Start the computer in safe mode (poking (not holding down) the F8 key during startup after initial power-on) and select Safe Mode as the method desired.
If the built-in Administrator account has no password, you will be in and can go to control panel, user accounts, and then change the password on the affected account.
If the built-in administrator account has a password someone else will need to advise as I don't have, or, access to password tools.