Have a look at Faststone Image viewer.
It has a slide show maker (with music if you want) and it works with W98.
Best of all, it's free. I've not used the slide show maker but the other parts of the program are excellent.
Fujitsu Lifebook P727 laptop review
Microsoft Paint set to die after 32 years
Mac power user tips and hidden tricks
Comment désactiver la saisie intuitive et paramétrer votre clavier ?