I cannot enter the bios.
My experience with these oldies, be charitable and toss the junker. Then ask around for an old P4. Not worth the pain and suffering (you might end up buying her a PC to just make the pain go away).
Everything inside seems as normal but very ancient.
Amen to that. Had this situation pop up at my work a few times already. A 166MHZ P1 is not going to work for anyone, I can't even think of a usable graphical Linux distro to run on there. Recently someone came to me with a Celeron 460 odd MHZ processor and 384MB ram, wanting it fixed. I can't legally install XP for him, and even if I could, it would so slow it's not even funny. I would throw on a Linux distro, but it won't work for this person.
I put XP on my dad's PC, a P2 400mhz with 384mb RAM. It runs just fine.