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Windows XP cannot update after install SP3

I encounter this problem few times on new pc that I just do windows update, during the windows update it ask to download the SP3 patch and i do have the file offline so i cancel the download. Then i install from my offline file, after installed the SP3 patch rebooted and notice that i can’t do anymore windows update but eventualy the windows update have downloaded the updates file but can’t install it.

Then i search from the google and manage to find some solution from microsoft as below:-

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.

Another workaround method is to update the Internet Explorer to 7 first then only install the SP3 patch and you can do windows update after that.

Source : Microsoft.com