Error when trying to install Win XP SP1

I am trying to install the final of Win XP SP1 on my work Corp XP Pro which has a real key and it gives me the following error:

The core system file (kernal) used to start this computer is not a Microsoft Windows file.

What does this mean and how do I fix it so I can install SP1?

:confused:
 
Installation Error Message: "The core system file (kernel) used to start this computer is not a Microsoft Windows file…” – Q327101, 327120
Message: "The core system file (kernel) used to start this computer is not a Microsoft Windows file. The Service Pack will not be installed. For more information, see Knowledge Base article Q327101 at h--p://support.microsoft.com".

Customers will receive this message when trying to install SP1 if they have installed BootXP, Windows Theme applications or other applications that replace the Windows kernel. This application replaces the NTOSKRNL.EXE boot file. Customers may see this same behavior with other theme applications as well such a Windows Blinds and StyleXP.

Resolution:

Uninstall 3rd party theme program from Control Panel > Add/Remove Programs. Attempt to reinstall the service pack. If SP1 still fails to reinstall follow steps 4 – 10 in Q327101. Attempt to install the service pack once you have completed those steps.

hope this helps
 
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