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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tabreborn
I have installed Avira Antivirus so I think no virus in my computer. :-\
sumit shokeen
VG when i try to edit the string CurrentType then im unable to change the value from current type to Checked. Please help me....
sumit shokeen
sorry VG
It really works !!!
Thanx a lot dude
ian
The "Checked" worked for me. Thank you very much :)
masilamani
very thank you
barry
you are a legend, wish i found this site long time ago. thanks very much. genius
sanjay
i did not see any thing tobe checked or unchecked on the path u told on regedit
i am having media centre version od xp sp 3
what to do?
nirmal
thanks a lot for service pack error soved
anantharengan.k
brilliant.really helpful.
rob
i tried your fix and now have a computer which wont start, it goes into a loop, wont start in safe mode, get the bsod so cheers! a big warning to any one thinking of trying this fix, and what do you mean by 'slipstreaming sp3'