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.

I have received a few mails mentioning a strange problem which occurs while installing SP3 in Windows XP. A few people told me that whenever they try to install SP3 in Windows XP, Windows shows following error message:
Service pack 3 setup cannot update a checked (debug) system with a free (retail) version of service pack 3, or vice versa.

The reason behind this problem is that the update package installs retail bits on retail builds and checked bits on checked builds. But you can spoof Windows updates in order to install retail bits on checked builds and vice versa.
If you are also facing the same problem, then follow these simple steps and your problem should be solved:
1. Type regedit in RUN dialog box and press Enter. Now go to:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows NT\CurrentVersion
2. In right-side pane look for a String value "CurrentType". Change its value to Checked and if its already set to Checked, then set it to Free and click on OK.
3. Exit registry editor and try to install SP3 again. Now it should install without any problem.
This article was posted by VG in following section: Troubleshooting, Windows XP.
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Mitesh Gurav
thanks dude u r really amazing.......................I was facing the problem and u solved it........
Aditya
hey i tried checked n free ....yet gettin d same errors
Nabeel
thx
Irildi
Wow that really works.Thanks man !
Christopher Dann
Great solution. This was causing me problems when i tried to install the Integration Services Setup Disk on an XPsp3 Install on Hyper V. My problem was with WDF01007.
Ankur Yadav
thank you soooooo much, i really works........once again thanksssssss
Laurentiu
Awesome, it really worked!
Sachin Kharat
Really superb technique......hats off.........!!!!!
Albela Mehra
DEEER Vishal
As per your name, you are vishal ...... hey y are big emormous big brother..... i have wasted a
lot of time on microsoft website but i could not find out solution of this ridiculous thing.....some
says this version is not available for odinary people. it for only for software engineer & it
professional...... then thought i have wasted time in downloding... somesaid for by online through network......
totally bull$hit rumour about it...... some say........purchase different kind of sofware to clean
your pc....... but in really nothinfg like that y proved it hey GADGET GURU...........
i do not why microsoft creates so many problems for innocent people........
Shyam
Thanks a lot!!!
It worked perfectly fine.