Delete all passwords from my acer aspire laptop

i have an acer aspire laptop, there was a previous owner that i bought it from, i cant download flash player or absalutley anything as its asking for an administrative password, i dont no it and iv removed battery ect, but n othings working this user that doesnt have this laptop anymore had holds over everything and its getting me down, please help.
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More about delete passwords acer aspire laptop
  1. You could ask him for the password. Or reinstall windows. If the administrator account is unprotected, you can login in safe mode and delete the password as well.
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