Photoshop CS3 does not recognise gif or png

When trying to open a gif or png, I receive the message:
"Could not complete your request because Photoshop does not recognise this type of file"
I am running CS3 and have just added the 10.5.3 update.

I have a similar problem that suddenly appeared. When properly working, I can save a tif file as a jpeg (or other)and the tag "tiff" will switch to "jpg" in the save description. That does not work anymore. A same example is when I save a Photoshop document as a "tif" or "jpg" or "png," the save description does not change any more to the appropriate form. Meaning, if I took a document named "Mydoc.psd" and tried to save it as a "jpg," I would scroll in the "Format" bar down to "JPEG." BUT, the title of the document will remain as "Mydco.psd." When I try to open it by double-clicking on it, Photoshop will not recognize it. I must open it thru Photoshop only.
Got recommendations?
Thanks anyone.

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