ntoskrn.exe missing or corrupt

[Bragi Freyr Gunnarsson]

Hello everybody.  
I have here a Dell d600 laptop running on win xp pro sp 1.  the user caught a virus (most likely bkdr_sub7.210) and brought the machine to me.  When I tryed booting the machine it brought the following error msg:

windows could not start because the following file is missing or corrupt:
<Windows root>\system32\ntoskrnl.exe.
Please re-install a copy of the above file

The machine is not connected to the internet for now.

I have tried using the recovery console to copy a new version of the file to its intended location (C:\windows\system32).  I have run bootcfg \rebuild and chkdsk \r.  

the bootcfg\rebuild and chkdsk programs report an unspecified error on the partition which make rebuilding impossible.

Has anyone here encountered a similar problem and found a solution?

Regards Bragi

[Bragi Freyr Gunnarsson]

I have also tried booting using the last known good configuration.  It gave no results.
Regards
Bragi

[Raptor]

NTOSKRNL.EXE is missing or corrupt.

[Bragi Freyr Gunnarsson]

I had OF COURSE tried all those things before I posted my request for assistance.  Maybe I should have stated that in a clearer manner.

I have solved the problem in the worst possible way: reinstalling windows xp and thereby losing data.  Luckily the user saved most of his work on a central disk.

bragi