Yeah, it could. I hate how there is no order to MS updates, like it will try to install sometimes .Net Framework 2 before 1
What you can do, is skip SP1 altogether, SP2 includes all Sp1 updates, so XP >> SP2 >> Sp3 is all you need to do. Or you can also Do SP1 >>> SP3
But you cannot do XP >> SP3......SP1 or SP2 is needed before SP3
And since you said SP1 installed fine I would just install SP3 with the SP3 installer >>>
http://www.microsoft.com/downloads/d...displaylang=en
Is it giving you a error # when it does error? Just wondering because that can often help