The UxTheme.dll patcher built-in to xpize 5 supports Windows XP from RTM through to SP3, and you can only install xpize 5 on an SP3 system so there would never be a case where you'd install SP3 after installing xpize, unless you're refering to XPize 4.7, which I recommend uninstalling before installing SP3, or better yet: reformat your system. am using Xpize5b6 via the patching method but even though I still can't apply unsigned MS themes like (Luna Roayle) why we can't let xpize make a default theme for us?