Since you intent is to wipe 98, your choice to attempt an upgrade to just go with a clean install.
But before you do, be sure to run something like BELARC ADVISOR so you can have any CDKEYs you had as well as an inventory of the hardware. Also, see if there are XP drivers for this laptop.
Can I ask one thing? Why didn't you tell about this laptop's make, model and hardware details? You could have availed yourself of insight about whether it's no-go.
I hvae this old laptop that I want to install XP on. My question is how do I uninstall Windows 98, and then install Xp?