thumbnail error

Hi,

I don't know what is wrong with the computer but every time i view the pictures in Filmstrip, the thumbnails of the actual pictures are wrong. You know how when you select a picture in Filmstrip mode, it will display the picture on top of the thumbnails. I am trying to say is the display picture is correct but not the thumbnails. Can anyone help me fix this?

ps. I didn't install any softwares and am running on windows xp. Thank You.