If the installation was made with a CD that doesn't include any service packs,
you need to install one of the earlier service packs before installing SP3. If
you try to install SP3 on a computer running XP with no service packs installed,
you'll see this error message.
Service packs for Windows XP are (always have been) cumulative.
Cumulative means they contain everything before them - so SP3 contains SP1a,
SP2 and everything between SP2 and SP3.
The only *catch* in this case is if you have a working install that has *no*
service packs. You have to at least have SP1 installed on the working copy
in order to install SP3.
Service packs for Windows XP are (always have been) cumulative.
Cumulative means they contain everything before them - so SP3 contains
SP1a, SP2 and everything between SP2 and SP3.
The only *catch* in this case is if you have a working install that has
*no* service packs. You have to at least have SP1 installed on the
working copy in order to install SP3.
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