In this case I'm afraid this could be due to a corrupt .vmdk file ("Error reading volumn information, please select another disk file")
Do you only have a single .vmdk file or multiple files? What's the size of the .vmdk file(s)?
In case of a single extract the first 1,024 bytes of the file and provide them as a attachment in your next reply post. (see http://faq.sanbarrow.com/index.php?action=artikel&cat=47&id=111&artlang=en)
André