how can I up grad to  microcosoft XP from my windows 98 second half?

My scenario is as follows.
Pentium III with Windows 98 that I want to use for backup storage.
Secondary IDE has CD/DVD player as master and CD writer as slave.
Primary IDE has 18 GB hard disk as master, which it boots from but is

Hi Brad,  It seems to me that just a couple of days ago someone wanted to
try something similar.  Unfortunately, I didn't pay it any mind. :(
I would get busy contacting the various mobo mfgrs. and see if they have
something to fit the bill.