Vista - can't view photos

I took out some cds that I had saved some family photos on and one folder that had my daughter's wedding on initially came up where you could see all the photos as icons. But soon after I got into it the pictures began to disappear and they became compressed lines, either vertical or horizontal. If you try to open them up you just see a bigger line! At first they were fine but one at a time over a few seconds all but four of around 50 picture began to compress into lines.

could someone please tell me why this is happening and how to fix it? the other folders all view ok. thanks