Hi, I also faced this problem for several times (i hope you have same problems, my autoexec.nt was missing).
The solution was in my case:
To search the disc C: for autoexec.nt and then copy it to C:\WINNT\SYSTEM32\
I think that even content of this file is not important, in my case there are many REM lines (thus with no funcionality), I only see this valid content:
Code:
@echo off
lh %SystemRoot%\system32\mscdexnt.exe
lh %SystemRoot%\system32\redir
lh %SystemRoot%\system32\dosx
(I'm running WXP SP2 but that's not valuable difference)