scanning the slide film

i have a epson perfection 4870 scanner, but i can’t have a good result scanning a slide film, i called the epson , but they don’t know , i need a clean crispy images,
my slide scanned images are horrible, fuzzy

do you know any other way to scan the slide?
i thought slide suposed to make image better than photo.

thank you

Are you putting the film in face up or face down? Sounds to me like you have the wroing side facing up.