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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tony
hey VG dude why dont u reply!!
pls pls.. reply!!!!!!!!! [:(]
paul
worked and i didnt think it would but it actually did!! THANKS
jl2rg
u R a GeNiUs... u HeLpeD mE A LoT... big thanks to you.
Moris
Hi,
thanks for your solution. I managed to install SP3.
But then occurred a problem that wasn't happening before.
Now, when I start Ashampoo WinOptimizer, it blocks and first appears "0==UtGlobalFree(pData->hGlobal)" message, and by clicking Ok or Cancel, appears "External exception 80000003" message.
Can you help me please?
VG
^^ it has something to do with the Ashampoo WinOptimizer. Try to uninstall and reinstall the app.
irfan
Thanks ................It work
thanks once again !
Clypto
Honestly you should also state that this fix can also crash a system, giving you only one way to fix it after that. Sufanek is absolutely correct, I dont recommend this fix. Get the correct download.
sunny
thanks its work
dave
Thnk...........i try to play gta4 ........but i need a service pack 3...i did as u said now its working perfectly thankkkkksssssssssszzzzzzzzzz alot
Face
SSuuuuppppppeeerrrr!!!!!!!!!!!!!!!! thanks man thanks a lot!