Updates are not installed successfully from Windows Update, from Microsoft Update, or by using Automatic Updates  
after you repair a Windows XP installation

SYMPTOMS
When you try to install updates from the Windows Update Web site, from the Microsoft Update Web site, or by using  
the Automatic Updates feature, you receive a message that states that the update or the updates were not installed successfully. However, the updates are not displayed in the Update History part of the Web site.

You experience this problem if the following conditions are both true:
• You try to update a computer that is running Windows XP.
• You have repaired the Windows XP installation by using the Windows XP CD.
. You have just installed SP3

Method 1: Register the Wups2.dll file in Windows
To register the Wups2.dll file in Windows, follow these steps:
1. Stop the Automatic Updates service. To do this, follow these steps:
a. Click Start, click Run, type cmd, and then click OK.
b. At the command prompt, type the following command, and then press ENTER:
net stop wuauserv
2. Register the Wups2.dll file. To do this, follow these steps:
a. At the command prompt, type the following command, and then press ENTER:
regsvr32 %windir%\system32\wups2.dll
Note For a computer that is running Windows XP Professional x64 Edition, type the following command, and then  
press ENTER:
regsvr32 %windir%\syswow64\wups2.dll
b. Click OK on each verification message that you receive.
3. Start the Automatic Updates service. To do this, type the following command at the command prompt, and then  
press ENTER:
net start wuauserv
4. Exit the command prompt. To do this type exit, and then press ENTER.