Could be a few things. Do your documents have headers and footers? PM does not like them, so remove them first. There could be graphics in them that PM does not have a filter for, so they should be moved to another file and imported later so you can find the errant graphic. You might also want to try re-installing the Word and Word Perfect filters from the Adobe Web site. I'm trying to think of all the problems I have had in the past, and that about covers it. But there are probably more suggestions out there...
Deb