Deborah,
I'd suggest printing out the README.TXT from Titanic Explorer, on page 8 it gives detailed instructions for a "Power User" Hard Disk Installation.
If you don't have separate folders for Disks 1, 2 and 3 you need to install them properly. BTW I stand corrected, you do NOT need to install all three disks, but you MUST copy the entire folder to your hard drive.
Since you are having some problems I'd start from scratch, uninstall TE (but not QT), defrag and start over. Mine installed easily when I followed the directions. I don't even have to turn off AOL, my screensaver or reset my display, it works so well. Do you know anyone locally who is a computer guru? Maybe they can walk you through it. You shouldn't have to hunt for files and other stuff, they should be installed and in their proper place. Moving stuff around can cause more trouble than it's worth!