the service pack works for Home, Pro, Corporate Edition, MCE 2002, MCE 2004 .. XPSP 2 turns all XP systems into "Pro" edition even though your system will still state "Home", XPSP 2 installs Pro components.. the network install just gives you some more Pro components and adds a lot of stability..
i have 2 laptops here.. 1 running Windows XP Home Edition, 1 running Windows XP Pro Media Center Edition 2004
both have had all versions of the full XPSP 2 on them (network install) and both have XPSP 2 Final release on them now installed from Network install and now both have the exact same Windows files, except the CE system has the MCE 2004 enhancement package (which got new drivers for it's components) and the Home edition did not.. but other than the Media Center Package on the one.. all other windows files are identical on both systems and not a problem 1 with either system.. not even a lock-up.. I've been using the Final Release version for 2 and 1/2 weeks now on both systems.. gave the older system to my sister... and they are both going strong.. I think they even tweaked memory management some as well in it .. I say this as games work smoother.. but besides that.. my sister uses PSP 7 and Animation shop fo rher groups.. she makes animated siggies.. she use to get Out of Memory errors on my old system and now she has yet to encounter an out of memory error in PSP.. and she uses about 80+ filters to enhance images...
the system she is using is the old home Edition laptop I was stating earlier.. working like a charm...
and not to worry.. so long as you have System Restore turned on before installing the package.. if you don't like it, just restore your system or use Add/Remove programs to uninstall it... very simple and easy to get going correctly... but i can almost guarantee that you will not uninstall XPSP 2..
anyhow I hope that this helps.