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 goto:
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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usman
No man not clear my porblem ...
Craig
Wow..... Totally amazing worked 1st time,.....true genius
Miguel Wojczyszyn
I tried the fix to install SP3, it got me past that first error message, but half way through the install, I received this error message
Setup cannot copy file sqlse.dll. Ensure that the location specified below is correct, or change it and insert "Windows XP Service Pack 3 source files" in the drive you specify.
Copy files from:c:\windows\softwaredistribution\download\16b2c96a0c41f4dfdb4d3cc228a4f819
what does all that mean? and how can I fix it?
thank you
chamara
hey man this really worked...ur da man...tanx dude...cheers
Joseph Prince
Thank you so much...You are great.....
sarmad
i tried ur way...it works....after installation i didnt restart my pc....also i changed registry value to previous value......after restart a loop starts....n computer restart again.....u have the solution vj??
i also tried with changed value but computer restart again....plz give me the solutio....
sarmad
i tried ur way...it works....after installation i didnt restart my pc....also i changed registry value to previous value......after restart a loop starts....n computer restart again.....u have the solution vj??
i also tried with changed value but computer restart again....plz give me the solutio....
rr
thanx 2 u ... i changed multiprocessor free 2 multiprocessor checked & could install sp3 ... bt after restart, it just went into loop restart ... so in the end had 2 remove sp3 from safe mode ...
any way 2 install sp3 smoothly ie without loop restarts ...
Gloria
Great!! Worked like a charm. I would be lost without this fix. Thanks!
Anburaj
Thanks a lot you are great i slove that problem with your guidence
by anbu Thanks Again