First, make sure that your anti virus software isn't locking the registry and
preventing the installer from modifying the same.
Error message when you try to install Windows XP Service Pack 3: "Access is
denied" or “Service Pack installation did not complete”
http://support.microsoft.com/kb/949377
Also see:
How to reset security settings back to the defaults
http://support.microsoft.com/kb/313222
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"NOCLEW" wrote:
> I have XP Home with SP2. I am unable to install SP3 either by downloading or
> using a CD. I get error msg "Access Denied" when about 1/2 through the
> install process. I have disabled Norton Anti-Virus but still unable to
> install SP3.
>
> Is there a fix for this?