Mike, check out this mskb Article. You can use the Recovery Console.
Check here also
http://support.microsoft.com/?kbid=823303
http://support.microsoft.com/kb/314058/
"Mike" <(E-Mail Removed)> wrote in message
news:6B2ACE0C-F8FD-47E9-9029-(E-Mail Removed)...
> Tried to do XP repair installation since I was getting a "stop: c000021a
> {fatal system error}" when booting up my laptop. Used the repair
> installation instructions on the Microsoft support page, but during the
> process got the message in the System Setup log:
>
> Error
> Setup could not register the OLE Control C:\WINNT\System21\initpki.dll
> because of the following error:
> LoadLibrary returned error 5 (5)
>
> Error:
> The signature for Windows XP Professional Upgrade is invalid. The error
> code
> is fffffdef.
>
> The system cannot find message text for message number 0xfffffdef in the
> message file for syssetup.dll
>
> Fatal Error:
> Setup failed to install the product catalogs. This is a fatal error. The
> setup log files should contain more information.
>
> Before trying to run the XP repair I was able to boot into Safe Mode, but
> now I don't know what to do. Any suggestions on how to proceed would be
> much
> appreciated! Thanks.
>
>
>
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