Hi again Stephanie Anne. I have only seen two "corrupt" errors. One is for the activation file and the other is for the Preferences file. Assuming you are on Mac, go here and delete this file. Macintosh HD>Users~username>Library>Preferences>Quark>Quark 6.0>XPress Preferences.prf
Most likely the error you are getting now is telling you that your preferences are corrupt. Deleting them will allow you to open XPress. Lots of open files when a power failure happens. BTW, don't delete anything else, just the XPress Preferences.prf file in the location I gave you.
P.S. Best to keep your issue in one thread, either by waiting for a reply to the post you first replied to or creating a new topic and then waiting for replies in that topic. It gets kind of confusing to track a problem when it gets spread over multiple topics. Other users will also have no idea what's going on because they don't know which topics are involved.