I am using Acronis True Image home v11 Windows XP Pro with SP3 I have a problem that is becoming quite distressing. I cannot make a backup image of the partition containing my Windows XP Pro, SP 3 operating system. Two weeks ago, to make room for new full backup of the partition containing my operating system, I deleted a verified correct full backup with 4 or 5 incremental backups. I did not have a problem when I made any of these backups. Since then, I have not been able to back up my "C" partition - the partition that holds my Windows operating system and a number of application files. I often restore files and petitions from the backups that I make using True Image. Not having a backup of this petition is distressing. Each time that I attempt to backup the "C" partition I get the following error message : 18: Error Monday, March xx, 2009 x:x:xx AM Details: cannot find a partition with the \local\HD_sign(DEA3DEA3) part_sn (F6D9xxxxCB80xxx9) star(63). I've used a number of programs that claim to fix the registry, I've manually search the registry for the string and not been able to locate the entire string, and I have searched the hard drive for the string and not been able to find the file on the hard drive either. Nothing that I have done have fixed the problem and let me up my specified partition. I ran the Check Disk (chkdsk /F and chkdsk /R) programs several times each during the time that I have been having trouble making a backup image (I have seen other CHKDSK switches mentioned but these are the only 2 switches in my operating system. "chkdsk /P" fixes problems on the disc and "chkdsk /R" locates bad sectors and recovers readable information.). The True Image program has no problem backing up and verifying other petitions on my computer. What can I do to get a good backup image of my partition?