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If the probelm happens only with that file, then the file is probably corrupted. If it happens often with otehr files, then you need to reinstall PS and the problem should be fixed.
It may also be that the file was crteated with a later version of photoshop, either 7 or CS. If the option to make the file backwards compatible at the time of saving was not checked, you cannot open it with older versions.
Hope this helps
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