So playing with the old Pavilion 542x was fun, even educational. In the end, Windows is about the only thing you can run on it and expect the ACPI to work. At all. With Win2K it runs just about as fast as it once did with XP back in 2002 when it was brand new, given I have doubled the RAM since then.
My daughter needs a computer and this one will have to do. She can get Cox Cable Internet where she lives, and we hope to have it soon, ourselves. They are just about the best in this part of the country.
When I got Win2K working, it was useful for about one day. Then I went back to my trusty old Inspirion 4100 laptop, still running CentOS 5.