Some JPGs stretched in finder preview

Hello,
I have a CD of pix from a photographer, all JPGs, that were perfectly normal and usable on my old MacPro.
But when I loaded them on my MacBookPro, some of the images, when viewed in the Finder preview window, are now smashed thin horizontally and stretched out vertically. I don't care about that so much, but an ancillary problem is that when I try to open them in PhotoShop CS4, they crash the application. I nuked them and reloaded them fresh, but the same thing happened.
Any idea why these photos would behave so strangely in a different OS?
thanks much,
Sean

In my case, images from my Digital camera show the preview icon or a generic tiff/jpg icon. I can set my view preferences to show icon preview as mentioned above (but this is typcally slower to display when opening the folder.) Opening the image in Photoshop then saving the file saves an invisible file that has a thumbnail image (for example filename is photo.jpg and an invisible file is created called .photo.jpg) when saved.
Regards,

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http://fire.red7.com/aperture-tests/DSC_0070-good.JPG
http://fire.red7.com/aperture-tests/DSC_0070-bad.JPG
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