Hi Vikki,
If you can open your photos in Graphic Converter, I would go ahead and use the SAVE AS option, use the jpg extension, and save to your dekstop or a folder on your desktop. You can then try import into iPhoto by simply dragging folder or image into iPhoto or iPhoto icon located on your Dock. Try one, if it works, do the rest of your images this way, save all to a folder and import folder...
Good luck, Rick
iMac G5 iSight 20" - 30G iPOD in Slimming Black - Mac OS X (10.4.7) - HP Pav 15" WS and Toshiba Sat 17" WS LP's - Canon 20D & A620