As we all know Microsoft has released the final version of Windows XP SP3 to public and its available via Automatic Updates, Windows Updates and Downloads Center.
Earlier we posted about it at following link:
Windows XP SP3 RTM Available on Windows Update, Automatic Update and Download Center
You can download the SP3 from the above mentioned link.

A few people are facing a problem while installing SP3. Whenever they try to install it, Windows shows following error message:
Service Pack 3 setup error. Access is denied.
OR
Service Pack 3 setup error. Service Pack installation did not complete.
If you are also facing the same problem, then follow these simple steps and your problem should be solved:
1. Download and install the Subinacl.exe file from here.
2. Open Notepad and paste following code:
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%\inf\defltbase.inf /db defltbase.sdb /verbose
3. Save the file with name "SP3.bat".
4. Now right-click on the file and select "Run as administrator". It might take some time to complete.
5. After completion, restart your system and now you should be able to install SP3.
This article was posted by VG in following section: Troubleshooting, Windows XP.
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Steve
Same issue as eskobra, after running the .bat file the internet does not work although it says its connected, any suggestions?
Larry
I did everythimg as stated PJ in safe mode and it still gave me access denied any ideas?
Danny
When I ran the .bat file is only flashed the DOS screen momentarily and seemed to have finishe. Should it not run for quite a while?
I tried reinstalling SP3 - same problem "Access Denied".
It seems like there is something wrong at the batch file level...
Seems like a good fix - if I can get it to work!
Arie
Thanks man, this fixed it!
GMat
After finally installing SP3 my internet is gone.
Scott
Any fix for this SP3 Setup error?
Service Pack 3 Setup could not backup registry key
HKLM\Software\Microsoft\Internet Explorer\MAIN\Feature Control\FEATURE_IMAGING_USE_ART
to file C:\WINDOWS\$NtServicePackUninstall$\reg00161. 5:Access is denied.
Abort Retry Ignore
VG
^^ Open regedit and goto:
Now right-click on "FEATURE_IMAGING_USE_ART" key and select "Permissions...". Select your account and assign "Full Control" to it. Apply it and now your problem should be solved.
workshop
subinacl.msi start that install it then run the bat file u made kk? :P
df
Jeah its help
Scott
I tried VG's fix but when I try to open the "FeatureControl" part of the link I get the following error:
Error Opening Key
Cannot open FeatureControl: Error whild opening key.