Any laptop being 4+ years old should boot from the 2000 CD- unless you somehow busted the boot record when you slipstreamed SP4 in it. Just press F2, del, F12 or whatevel your bios needs while booting and change the boot device sequence within bios (I know it's not possible on some odd and old portables, eg Toshiba Libretto- boot sequence can be changed only within Windows, which sucks- hope not your case).
Anyway- if you haven't changed the initiial 2000 CD structure you can still use the 2000 SP4 CD after booting from the 4 diskette set. If it is one of those... errr... slightly suspect "n in1" CD's, then I'm afraid you cannot do much...