From previous experience, a format may be your only option. As you have the '98 discs, you would only lose the office programs.
It would still be of value to a worthwhile home without them, but as I said, they are cheaply obtainable on Ebay.
Sea of Thieves Review
Dell Canvas review: the cheap Wacom Cintiq alternative
How to use iMovie for Mac, tips and more
Comment filmer l’écran d’un iPhone ?