|"they are saved as DOC files but may be word perfect files, I don't really remember"|
Not very helpful to us. Can't you tell from the filename extension? WordPerfect files are usually .wpd or .wpx (where x is the version number), whereas Word files are either .doc or .docx
Word 2007 can only open WordPerfect 5 or WordPerfect 6 documents, so that could be your problem. If they were Word files they would open easily in Word 2007.
You need to find your old WordPerfect installation disc & install it.