i tried to search for it in the registry bu i couldnt find the "\WindowsUpdate\AU" in the
"HKEY_LOCAL_MACHINE \Software\Policies \Microsoft\Windows \ " section.
I am using microsoft windows XP professional to re remind.
And actually what was the purpose of changing the registry key.
Was it meant for my shutdown problem
or was it for the #9 post(two steps above of this) ?

Surprise surprise!this is one funky problem, we'll crack it though.Im sticking to the roots of what your prob is(shutdown problem)
---
follow these
-checkdisk
-windows repair through Recovery Console

if all fails post a HJT log and paste it here

It has something to do with shutdown.exe of windows. It is place at start up you can stop this one by going to run command then type shutdown -a. It will stop fro executing..

Fair enough,but if you read the whole post youll find he needs to do that every time and that should not be a continues thing when a user starts up.

Interesting lil problem that you have. Have you already checked that when you type the full command in the run window that you get the same thing..? ie type cmd.exe instead of cmd
And have you checked that in these two keys below that cmd points to system32\cmd.exe ? This reg file will fix that for you...

I had installed Digsby on mu computer.
Whenever I start the mesage that used to appear when I started cmd reappears.
What is happening, I dont know.
What shall i do?

ohk I dont know if you followed gerbill's post eighter way drop a High Jact This log here so I can have a good look to see if theres any sussy behaviour.if you not firmiliar wi with Hijack This let me know

I could add that you were infected by a known piece of malware, most likely via an infected thumdrive. Try this:
==Download SDFix from here: http://downloads.andymanchesta.com/R...ools/SDFix.exe
and save it to your desktop. Dclick SDFix.exe and choose Run to extract it to %systemdrive%, which commonly will be C:\

** ==Download this temp file cleaner from http://www.atribune.org/ccount/click.php?id=1 --click in the download window to run it, and when ATF Cleaner opens go Select all, and then Empty Selected.
Next click Firefox [if you have that browser..] at the top, Select All again, and Empty Selected again. Follow that procedure also if you have Opera.
Close ATF. Run ATF in any other accounts.
=You must restart your computer in Safe Mode:
- press F8 several times while POST is running and before IDE detection completes.
- On the Windows Advanced Options Menu, select Safe Mode and press Enter.
- When the Boot Menu appears again, select Microsoft Windows XP and press Enter.
- Log in by using the Administrator account and password. NOTE: The password is blank by default unless you set a password.
=Open the extracted SDFix folder, C:\SDFix and double click RunThis.bat to start the script. Type Y to begin the cleanup.
You will be prompted to press any key to Reboot - the pc will then restart.
The tool will run again and complete the removal process then display Finished; press any key to end the script and load your desktop icons.
Once the desktop icons load the SDFix report will open on screen and also save into the SDFix folder as Report.txt.
Restart the pc in normal mode. Post the contents of the file Report.txt here, along with the log of a fresh hijackthis scan run in normal mode.

** Instead of ATF you may wish to substitue this cleaner.. it is the one I use regularly.
==Get CCleaner from http://www.ccleaner.com/ - and install it in a new folder. You should keep this one for general use. I set the installation checkboxes only to open from the recycle bin. It's neater that way.
Now run CCleaner from the recycle bin rclick menu using its default settings [if you set up CCleaner as i suggested, rclicking the bin icon should give you the Open CCleaner option...].
If you have FireFox open the Applications tab and ensure at least that Cookies and Cache are checked.
Select the Cleaner icon, press Run Cleaner.
[For future quick temp file cleaning select the options you wish to use via the Windows and Applications tabs ..]

I had informations about replies in my inbox,
but I couldnt find those in the forum, I was amazed. Its just today that I realized that everything had gone to the Page 2. Sorry for that. Any way, I tried the "cmd.exe"
instead of cmd , but the result was same.
I searched in the registry for the mentioned keys, I it wasnt there. Inside HKEY_CLASSES_ROOT\Folder\shell, there are only "explore" , "teracopy" , and "open". What should I do. Cant I add the key there, or what is it that I should do?
This is the same for another key too. I couldnt find it( actually it wasnt there).
I also have run "chkdsk" from cmd for c:
but it had no effecct.

what bout post #18