Cannot get into Administrator account

I have Vista Home Premium and i have two account on my computer Parker,
and Administrator. I no longer know the administrator password because i
changed it to keep my son out and i ended up to forgot it. I can log
onto Parker but it has no administrator credentials. I have tried to run
the command prompt as the administrator but it says i need the password
to do it. I have also tried Safe mode but that doesn't work either. If
there is anything i can do please help.

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