I have just begun using Paragon Backup & Recovery 10 Free Edition. I have an Asus Eee on which I've recently re-installed Windows XP (from disk image on CD-ROM that came with the computer). That install was followed by installing of Windows updates, installing of Avast5, and installing of various utilities and applications from original CDs, Download.com, and SourceForge.net. I then used Paragon to make a backup to a folder on an external HD. I use this external HD for various data files and backups, so I scan it weekly. Today I scanned it with Avast5 and got a warning for one of the files in the backup folder created by Paragon: High Threat: Win32:Hupigon-ONX[Trj] I then used Avast5 to scan the Asus Eee, and got a clean scan. As best I can recall, I haven't deleted anything from the Asus since I made the backup. So I am wondering, do I have a trojan in my backup? If so, how did it get there?