Failure to reboot after downloading SP4 on Win 2000 Pro

[Joy]

Can anyone help with our problem?
We have downloaded the Service Pack 4 and installed it to
update Windows 2000 Professional on our laptop. On
rebooting after closing down it comes up with the message:
<windows2000root>\system32\ntoskrnl.exe. file is missing
or corrupt. We have got a copy of this file from another
computer but can't get any further into booting up the
laptop to install it!!

I'd be grtateful of any advice Thanks!

 

[G. Samuel Hays]

You should be able to boot up from the CD and use the recovery console.
You'll also probably find a working
copy of your ntoskrnl.exe in one of the service pack folders.

Remember you can copy things ONTO a drive with recovery console, but not
from the drive.

Good luck,

-Sam