Erasing Data on a computer

Erasing Data on a computer

I am sending my laptop back to Acer tomorrow to get rebuilt from the bottom up. I wanted to reformat the hard drive but I don't have the appropriate software to do so. Does anyone know of a program that erases personal info from your computer? I don't have much on there, but I would like to get rid of passwords, pictures, etc.
Jerusalem artichoke

Jerusalem artichoke

Plant ID – Help?

Plant ID – Help?

Our Little Apartment

Our Little Apartment

Well Well Well

Well Well Well

Planting an orchard, Zone 5

Planting an orchard, Zone 5

What a difference a day makes… </song>

What a difference a day makes… </song>