FRONT PAGE 2000,,,, JPEG problems!

I have installed FP2000, when im working in /NORMAL/ option i can see every pic, same using /HTML/ option, BUT, when i try to see on /PREVIEW/ option i get an |x| (whitebox with red X) and i cant see my pics, this just happen with JPEG format, causewithgif’s works fine. When i upload my pages to a site, they works.
How to repair my fp?? my browser? my fp2k? what??