This documentation is no longer applicable to any supported PDQ product and is not being actively maintained. This document exists purely as an historical record, or to provide good chuckle.
We have seen several questions or comments about scanning XP or 2003 systems from a Windows 7 system. There appear to be performance issues when Windows 7 computers copy data to versions of Windows earlier than Vista. Here is an article which describes some of the issues and work-arounds that you can employ.
Thanks to Terrence for notifying us about the issue.