From Microsoft. (make sure you create a restore point before doing this. Also when you get to the end to do the sp3 update. Turn off the internet connection again and disable the virus scanners, firewalls, and any other security style software.
Method 1: Reset the registry and the file permissions
Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
) How to back up and restore the registry in Windows
To reset the registry and file permissions, follow these steps:
1. Download and then install the Subinacl.exe file. To do this, visit the following Microsoft Web site: http://www.microsoft.com/downloads/details.aspx?FamilyID=e8ba3e56-d8fe-4a91-93cf-ed6985e3927b&displaylang=en
2. Start Notepad.
3. Copy and then paste the following text into Notepad.
cd /d "%ProgramFiles%\Windows Resource Kits\Tools"
subinacl /subkeyreg HKEY_LOCAL_MACHINE /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CURRENT_USER /grant=administrators=f /grant=system=f
subinacl /subkeyreg HKEY_CLASSES_ROOT /grant=administrators=f /grant=system=f
subinacl /subdirectories %SystemDrive% /grant=administrators=f /grant=system=f
subinacl /subdirectories %windir%\*.* /grant=administrators=f /grant=system=f
secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose
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4. Save this Notepad file as Reset.cmd.
5. Double-click the Reset.cmd file to run the script.
Note This script file may take a long time to run. You must run this script as an administrator.
6. Install Windows XP SP3.
If this method resolved the error message and if you successfully installed Windows XP SP3, you are finished.