cannot upgrade W2K to XP-Pro due to third-party kernal

During the procedure to upgrade from Windows 2000 to Windows XP Pro, I get the message that:
"Setup cannot upgrade due to a third-party kernal" How do I determine what this is and how do I fix it?
BobArnettAsked:
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nbutterhornConnect With a Mentor Commented:
Why dont you just back up your data, formatt the pc and do a fresh install?
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eatmeimadanishCommented:
Sounds like the ntoskrnl.exe file has been changed.  Either spyware, or a boot picture has been changed in windows 2000.  I would run SFC /SCANNOW from the command prompt and insert the 2000 cd.  Once this is completed try upgrading again.
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BobArnettAuthor Commented:
Well, I treid just about everything else first but it turned out this was my only real option. Thanks
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