Top five updates for XP sp1 and sp2

If you could only choose 5 updates or less for Windows XP, which would
they be if:
1) you only had sp1 installed
2) you only had sp2 installed

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1) For sp1:

KB824146 (msblast virus) because I've experienced the need with
computers connected directly to the net (no NAT router)
KB822603 (usb update) because I guess the updated usb drivers will be
better

My knowledge only makes it this far... yipes