|Press the Pause button during boot so you can read the writing on the screen. Down the bottom is the info of how to get into setup / bios. Press the space bar to move on.|
On HP it looks like ESC will be the key.
Once in the bios, make sure it is set to boot from CD first & save any change.
Put your XP CD in the drive & reboot.
Press any key, when you see the message & the XP install will begin.
The Press any key message does appear again during the install, but you don't touch it.