My Nikon D60 doesn't show me all the pictures when plugged in

Hi I'v got this problem with my Nikon D60 when I plug it in on my computer it doesn't show me all the pictures I'v taken, I have about 623 pictures I'v taken by this camera but when plugged in only shows 524, I don't get it why, can anyone help?

My Nikon D90 will start putting pictures into a different folder under certain circumstances. Maybe your D60 has done that. Put the memory card on a computer and poke around in the folders to see if you can find the other 100 pix.