Jeff:
Your Presario is even older than mine. In my case F10 gets me into BIOS without anything on the HDD, and changes I make are saved to CMOS. I don't know if changes made on your PC are saved only to the 10-12MB HDD area or also (or only) to CMOS on your motherboard. If the latter, good news. If not, things might get trickier.
I do not recommend the overlay scheme for NASLite+. Instead see Eden's recommended option 2 in his 12/8 09:20am post.
Start by changing BIOS settings to boot from first from CD-ROM, then Floppy. Also force the HDD to type=none. You may have to install the softpaq Eden found you in the previous post, and/or also use the following to get F10 to work again to make those changes: (
http://h10025.www1.hp.com/ewfrf/wc/softwareDownloadIndex?lc=en&lang=en&cc=us&os=19&dlc=en&product=92835&softwareitem=33817).
Once your PC is able to boot from CD-ROM you can use FDISK (or another low-level format utility) that destroys all information on the hard disk (in particular the overlay scheme).
Now you can test your free NASLite floppy to make sure it works WITHOUT overlay schemes. Make sure the full HDD capacity shows up properly. And if you are still successful booting from CD-ROM (test it with anything that boots (Knoppix, WinXP Setup, DiskDrive Installation CD, etc)), then NASLite+ should work for you later.
Report back your progress ...
Georg