stop 0xca blue screen, cannot boot

I am unable to boot my computer as it hangs before the point I could try to enter safe mode. I get the BSOD with error message 0x000000CA, which means PNP_detected_fatal_error, when I try to boot from the Windows XP reinstallation disk that came with the machine (Dell Inspiron E1705 with Media Center, running Windows XP SP3).
I get the same error message when I try to boot Windows on CD using UBCD4Win software, or when I try to start the machine using the Media Center button. I am able to boot Windows on CD using Active@Boot Disk Trial software.
I have removed whatever viruses I could find with Kaspersky and Sophos SAV32CLI, but my ability to run software on this computer is pretty limited. At least my files are all backed up elsewhere. I would rather not have to wipe everything out anyway.
I found Virus Agent-SQZ, which I seem to have acquired the last time my PC ran properly. It infected Java 6 files and Temp files.
More info: Stop 0x000000CA with Parameter 1 = 0x1 lists cause of error as Duplicate PDO: A specific instance of a driver has enumerated multiple PDOs with identical device ID and unique IDs. I did not install any new hardware or software recently. Currently I am unable to reinstall my drivers. All diagnostics pass except that I get the message that the scan cannot identify the Dell Diagnostic Utility Partition.