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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vakil ahmad raini
sir i hv not use sp3 because its hv many problems so plz sloute this problem
Barbara
Worked, thanks!
Jason
Your advice here is amazing. I spent two days trying to download Service Pack 3 on an XP computer that hadn't been used in 2 years and kept getting an error. After doing your two steps I had it downloaded within an hour. Note to others: After you run step two, be prepared for a lot of files to be run through at light speed. A little unnerving at first but it's part of the process. Thanks again for the advice on this problem -- it worked for me!
Jason
Also, there was no option to run as ADMINISTRATOR, so I did the only other logical thing and hit run anyway. It worked fine.
Don Sublett
I tried this and still get the same error
Don Sublett
I tried this and it did not work. Not only did it not work I no longer have internet access, wireless is gone, can not manage hardware because nothiing is listed, and can not even log into the computer. I am totally on the outside looking in. May have to wipe the computer and start over if no has a fix.
Lou Bonnell
followed your directions and saved to notepad as SP.bat. But when I right clicked the file I couldn't find run as administrato my system is windows xp professional. Could you help plse. STill trying to download service pack 3 without getting access denied.
eseth2k
Unable to install SP3.. require Help, won't uninstall the Microsoft posted solution way (on microsoft help)
Any Forceful Personal solutions you can think of?
VG
^^ What problem are you facing while installing SP3?
amit
i tried but it just stuck on perfoming cleanup windows.
any further advice would be appreciate