I've used Paragon's 2010 for about a year with no problems until now. Upgraded to 2011 thinking that may solve problem. I have 2 internal IDE HD's each partitioned 4 ways. Backup is to a WD 500Gb external USB . All drives pass a CHKDSK screening. When running a 0 Drive backup (the only drive with important data) it gets to about the 5Gb point on the backup drive and system reboots. It will remain stuck in this reboot state until the external drive is unpluged from the USB port then it comes to ready at the Windows XP screen. Also have XP at SP3 level. This system has worked fine until recently (regarding backups) The External drive has been tested using NTFS format and returned to FAT32 with no change in performance. Any thoughts?