First check manufacturers web for any info for your Upgrade.
If you are able reformat and Partition with the XP pro disk(or other Boot Disk) You may find your XP disk is dirty or scarred or just finicky , so copy the pro disk to a partition not used for O/S and install from there.
I have also found DVD drives unreliable/touchy, use the CDRW to Boot and install.
FYI If your XP Home edition is a Microsoft disk ,you do not have to install XP Home first,The Pro disk will say it does not find a Qualifying O/S and will ask where it is .Just remove the Pro CD and place the Home CD in the Rom drive and point the window browse to the the rom drive click O.K. Then replace the Pro disk and continue with installation.This is the best way to install if you can.