If you downloaded them off of the camera they ought to be in a file like mydocuments\mypictures or some such. IF you didn't download them off of the SD card or whatever media the camera uses then it should still be there.

If you don't know the file name, you can hit the start button then click on search. Under that seach for pictures and for the file name use *.jpg (assuming the pictures are stored in that format.)

Don't know if that helps.