I recently had some trouble with my PC, and I replaced both the motherboard and the power supply. Now the system boots, but it tells me that a windows system file is missing, so windows cannot boot. When I attempt to boot from the Windows XP installation CD to repair the installation, it will boot from the CD, but it just freezes during the hardware inspection phase. There is no problem with the CD-Rom, I have tried the CD-rom in other machines and it works fine. The power supply and motherboard are both brand new. Does anyone know what might be causing this problem? I'm running out of ideas here. Thanks.