Here is the step by step to remove SP2 from XP. http://support.micro...kb;en-us;875350
As far as the 'Shutdown' issue, there are many causes for this. Why don't you do the Service Pack first. Then if the problem still exists we'll tackle that after.
Here is some info that will help with the 'Windows Update' issue.
Why can't I download updates?
Lift All Update Restrictions by downloading and running this regfile. For Permission issues read this article.
To get the updates to re-appear and/or to be listed as available again. Go to Start/Run/CMD and type in:
del /q "%SystemRoot%\System32\Catroot2\Edb.log. Then try again.
Can't download any updates and/or you receive an error message: Go to Start/Run and type in: regsvr32 wintrust.dll. If that doesn't help: Go to Start/Run and type in CMD. At the command prompt, type the following commands, pressing ENTER after each line:
net stop cryptsvc
ren %systemroot%\system32\catroot2 oldcatroot2
net start cryptsvc
Or run this script, then try the install again.
Correct the Cryptographic Service Error Message
Another issue: When you use the Windows Update scan feature, the scan quickly reaches 100%, and then displays the "There are no updates available at this time" message. To correct this:
Verify that your computer's date and time are accurate and that the Internet Explorer language option is not empty.
To check the language setting in Internet Explorer:
1. Click "Tools" and then choose "Internet Options"
2. Click the "Languages" button
3. Make sure at least one language is listed in the "Language Options" dialog.
If the above hasn't helped: Go to Internet Explorer/Tools/Internet Options/Connections/Lan Settings and uncheck: Automatically detect settings.
Windows Update Site Lists Updates That You Already Installed http://support.micro...B;EN-US;Q319109
Troubleshooting Windows Update Issues http://v4.windowsupd...m/troubleshoot/
Errors Occur When You Try to Install Updates from the Windows Update Web Site http://support.micro...om/?kbid=817753
Troubleshooting Windows Update Issues: http://www.kellys-ko...xp_u.htm#update
Windows Update Restriction Error (Network) Line 28 http://www.kellys-ko...m/xp_tweaks.htm
Windows Update Greyed Out - Restore (Line 179) http://www.kellys-ko...m/xp_tweaks.htm
Best of luck,
Edited by ultra_classic, 28 May 2005 - 06:46 AM.