Finally, a successful install! I had purchased a used 5oo Mhz iMac for my wife, and so took over her 1998 300 Mhz AMD K6-2 machine, with a 4 GB hard drive, 288 MB RAM, and a 64 MB nVidia GeForce MX400 graphics card. Whatever prevented installation on my other machine didn't prevent it on this one, and the install went flawlessly (although it took 45 minutes or so). Machine boots up and runs well, although some parts of the control panel don't work, so can't change some items from default configuration (although there is no pressing need to do so, either). Setting up the modem was very easy, and I was online in just a few minutes. Next step is to configure my email client and see how that works. Given that this is just version 0.78, I am greatly encouraged, and look forward to version 1.0.
Previously, I had tried SuSE 7.1, Caldera OpenLinux, Mepis, and BeOS, and still use BeOS as my main OS. However, I do realize that some applications are not very well developed for BeOS, so thought I'd try PC BSD. Now I'm glad I did.