thanks for the reply. well.. i'm trying to save some space on my cd instead My CD came with SP1 integrated. If i just integrate SP2 into this CD, my CD will contain both SP1 and SP2 files. the CD would copy SP1 files that aren't needed too, right? I don't really want that happen since i'm quite limited to space on my hard drive, too. so i was thinking of integrating SP2 into XP original directly (which I don't have).