My PC's hard drive is a graveyard of old legacy files of things that don't exist anymore, going back several generations [View all]

Every time I've had a new PC built, they just emptied the entire old hard drive into the new one. I'm getting ready to get a new PC.

There are multiple generations of files for old programs, old hardware, old phones; whatever a hard drive acquires and stores in its life.

I'd like to get the graveyard of old files & references out of my hard drive before it gets loaded into my new PC so I can start more fresh. I've spoken with someone who says he can help with this.

Can someone give me tips and pointers on how this can be accomplished?