this U.Z.A thing is becoming a big problem now. and these seems to be no good tutorial on the internet about this.
below is something i found while surfing for this and i would like to share it. i did try this and did remove it from the current user i was in but didn’t help the other users. so i guess its back to exploring.
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what u need to do:
Go into registry
hklm\softwar\microsoft\windowsNT\currentversion\winlogon\
delete “IgnoreShiftOveride”
hkcu\software\microsoft\windows\currentversion\policies\system\
delete all hives under system, but default.
So now you can open Task manager use shortcut Ctrl Alt and Del
select Process Tab
From there you can find UOS.EXE .end process that one
Go to C:\Windows\System
Delete UOS.EXE
Ok Now is to change boot logo.
okay go to System properties from control panel or use the easy way (press windows button and Pause Break from the keyboard.)
okay select the Advance tab
under the startup and Recovery go to settings
Now find a Edit button
Now it will take you to the boot.ini
here is the Default file.
[boot loader]
timeout=30
default=multi(0)disk(0)rdisk(0)partition(1)\WINDOWS
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINDOWS=”Microsoft Windows XP Professional” /noexecute=optin /fastdetect
so delete any thing comes after fastdetect
Okay now the last thing , to change the UZA O/S near the system clock.. right?
change this keys from Registry
HKEY_CURRENT_USER\Control Panel\International\
“sTimeFormat”=”h:mm:ss tt”
and delete these dll’s from the directory (which you might not find)
C:\Windows\system32\
DPP(1).dll,DPP(2).dll,DPP(3).dll,DPP(4).dll,DPP(5).dll,DPP(6).dll,DPP(7).dll,DPP(8).dll,DPP(9).dll
DPP(10).dll
C:\Windows\system32\VisLoader.exe
C:\Windows\boot.bmp
C:\Windows\system32\PWallpaper.jpg
so now restart and check how it went.
original tutorial obtained from
http://modish.wordpress.com/2007/08/14/uza-operating-system/
One might think that turning off the feature that allows Windows Update to automatically download and execute new patches would, in fact, disable automatic updates. Apparently, one would be wrong. This behind-the-back updating, said Microsoft, is necessary in order to avoid misleading customers. Some users found it rude, and others said it could even potentially upset criminal cases. 
