OK, I tried that, but the errors didn't go away. In the process, I also found out that the KDE packages appear to be installed, but KDE (which was my desktop before the upgrade) doesn't launch and it's not in the xwmconfig menu. I'm tempted to just wipe the hard drives, re-partition, and start from scratch, but I'd prefer not to.
To prepare for the upgrade to Slackware 14, I downloaded the ISO (32-bit) and burned it to a DVD. I mounted the DVD and, as root, copied the contents of the slackware directory to /home/rooty/ where I have more room and the packages wouldn't be read-only. Then I followed Patrick's instructions in the UPGRADE.txt file. I have upgraded several times on this same Dell computer and haven't had any problems before. Anyway, let me know if you think I need to start from scratch. Thanks, again.