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Number   :  2573
Date     :  2002-07-30
Author   :  Kan Yabumoto
Subject  :  Re: Corrupt USERENV.DLL in NTFS partition
Size(KB) :  2



Simon:

Naturally, the floppy-based boot technique relies on a healthy
state of essential Windows system files. Since a significant
number of booting problems are from the files that are saved
in the "quick boot diskette" described in XXTB #33, it is a
viable "band aid" which works in a surprising number of occasions.

If a corrupted file occur anything beyond the files that are
kept in the quick boot diskette, like in your case, you just
cannot expect it to work. To cover such cases requIres a
huge "diskette" whose capacity equals *ALL* the essential
files in the windows system directory which is beyond the
scope of the scheme.

If it were a FAT volume, it would have been as simple as
booting in DOS (v.7.x --- possibly using the boot diskette
for Win9X) and manually overwrite the corrupted file(s).
In your case, with an NTFS volume, it is harder to access.

One "official" way without resorting to third-party solutions
is to use the recovery console (one should always install
the recovery console on the hard disk (C:\cmdcons\) for
such an occasion. If you don't have the "Recovery Console"
option in the boot menu (i.e., you have not installed the
recovery console on your hard disk), then, you must do
the same thing using the WinXP Install CD. Follow the
installation procedure and you will find a branching
point where you can select the Recovery Console option.
Once you enter the environment, it is just like a
DOS environment with similar set of commands (such as
CD, DIR, COPY, etc.). You should be able to copy/overwrite
the corrupted file (USERENV.DLL) which had been copied
into a floppy from a healthy system.

Another (lengthy) option is to re-install XP on top of
what you have which can preserve the settings but
re-install corrupted files.

Disclaimer: I have not done the procedure that I wrote
in here. I described what I would do next from my
(limited) experience. You do it on your own risk.

Kan Yabumoto
==========================================================

At 2002-07-29 05:15, you wrote:
>I have a Windows XP Home Edition running on an NTFS partition.
>
>I recently go an error on startup saying that USERENV.DLL has a checksum 
>error.
>
>I thought that if I could boot XP via a floppy then I could copy a good 
>version of the file over the old corrupt one.
>
>I cannot seem to get the system to boot via a floppy.
>I have looked at your article on booting with floppy disks but this only 
>covers fixing problems with files in the root directory and does not seem
>to be able to fix issues with files in the SYSTEM directory.
>
>Or is there a tool which could copy the USERENV file from a floppy disk 
>running DOS to the NTFS partition?
>
>I hope that you can help or point me in the direction of a tool that may help.
>
>Thank you
>Simon Murphy



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