like many so called standards TIFF isn't a single standard and developers can, and do, modify it. Usually done via the tags (the "T" part of the TIFF name), given Microsoft's somewhat bizarre interpretation of the word "standard" that might have something to do with it if, as you say, the images have come from a Microsoft product.
That said TIFF compatible viewers are supposed to ignore custom tags that they can't read and normally that will show the image.
my suggestion is as Eugene said get Graphics Converter. It's a veritable can opener of Image files (and has some basic but effective editing tools) even if a tag is corrupted or invalid it shouldn't have a problem opening it, then once open save it to a different format or do a save as and save it as a new, more standard, tiff file
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