Ah, got it. It was F5 to enter safe mode, not F8.
Anyways, after about 14 tries, I finally managed to enter safe mode on the new 120GB drive, with the old 30GB drive with the data I needed installed as a slave. I then was able to copy/paste most of the files I needed into the new system. Disaster averted.
Now I guess I begin reinstalling my old apps, setting up user accounts, and restoring my system to the way it was before, more or less.
Now that leaves me with the issue of NTFS-encrypted files on my old drive. I'd like to get the system to boot from that old drive so I can decrypt the files and transfer them to the new one. Although the drive worked when installed as a slave, I still can't get the system to boot from it as a master, even in safe mode. Nothing I can't live without is in there, but I want them back anyways. And yes, I know encryption isn't an option with XP Home Edition.
Any other thoughts, anyone?