I Need to Clean Up an Old Computer to Give it Away

I have a Sony PC running XP that I am getting rid of.

I don't expect to sell it but even taking it to school or the Goodwill
I want to securely clean all my data off the hard drives.

What advice do people have about formatting / those programs to wipe
disks / ...

How do you clean everything off while still running the OS?

An advice for a pretty basic user would be much appreciated.

Thanks

.

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