|"This was working in the past but all of a sudden, all of the new computers are having this issue".|
If the computers in question are new they may not be able to run WinXP. At the very least you may need to slipstream some critical drivers that obviously would not be included in the WinXP sp2 CD.
I recommend you slipstream SP3, SATA controller drivers and possibly chipset drivers into the WinXP sp2 files and then burn a new CD. nliteos makes the slipstream very easy to do. Get nlitos at the link below.
Do you have non-essential external hardware connected? If so, disconnect it until after the installation is complete and updated.